Squeak-dev June 2014

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41 participants
191 discussions

Fwd: Re: [squeak-dev] Class subclasses
by Florin Mateoc 15 Jun '14

15 Jun '14

I am pretty sure this was intended for the list... -------- Original Message -------- Subject: Re: [squeak-dev] Class subclasses Date: Sat, 14 Jun 2014 07:22:28 -0700 From: Eliot Miranda <eliot.miranda(a)gmail.com> To: Florin Mateoc <florin.mateoc(a)gmail.com> Hi Florin, On Thu, Jun 12, 2014 at 7:45 PM, Florin Mateoc <florin.mateoc(a)gmail.com <mailto:florin.mateoc@gmail.com>> wrote: On 6/12/2014 11:54 AM, Eliot Miranda wrote: > Hi Florin, > > I think I'm correct in thinking you can always submit a proposed fix to inbox, even if you don't have commit > privileges to trunk. > > > On Wed, Jun 11, 2014 at 8:44 PM, Florin Mateoc <florin.mateoc(a)gmail.com <mailto:florin.mateoc@gmail.com>> wrote: > > Hi, > > I think this is an old bug, presumably since ProtoObject was introduced (and presumably because ObjectTracer > was used in > the process). > > If you ask Class for its subclasses (or if you inspect it) you see that ObjectTracer class is listed along with > ProtoObject class, although ObjectTracer's superclass is ProtoObject. > This can lead to some funny bugs if you try to write some hierarchy traversing code. > > Cheers, > Florin > > > > > -- > best, > Eliot Hi Eliot, I thought the fix was obvious - we just need to evaluate "Class removeSubclass: ObjectTracer class" - so other than pointing out the bug, I am not sure what else I should do. well what one could do is a) create an update b) create e.g. a Kernel package containing a postscript that says Class removeSubclass: ObjectTracer class c) create another update I *think* that forces the load of the package with the "Class removeSubclass: ObjectTracer class" postscript. Bert, am I right? Cheers, Florin -- best, Eliot

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New Cog & Spur VMs available
by Eliot Miranda 15 Jun '14

15 Jun '14

see http://www.mirandabanda.org/files/Cog/VM/VM.r2987/ CogVM binaries as per VMMaker.oscog-eem.769/r2987 platform code: Type the memory allocators as accepting and answering usqInts to give a chance at allocating more than 2Gb. Use unsigned comparisons when testing if there's sufficient heap space in readImageFromFile:HeapSize:StartingAt:. Leads to accurate failure message when failing to allocate large heap. Correct syntax of inline assembler for byte and word swap operations in win32 16-bit displays. Thanks to Nicolai Hess! sqUnixX11.c: Include the right X11 include file to pull in the def for XK_equal (keysym.h vs keysymdef.h). Don't define BytesPerOop or BaseHeaderSize; these should be taken from interp.h. Integrate Philippe Back's fix for numberic keypads on X11; see https://pharo.fogbugz.com/f/cases/11352/. Add the XDisplayControlPlugin to the plugins loaded by the image build script. Use pthread_atfork to reinstall the heartbeat thread post fork. Make sure SIGALRM is unblocked if using the interval timer heartbeat on linux. Remove RPATH spec from unix builds. Include the executable name in the crash.dmp report. Fix stack backtrace printing on Mac & Unix to not segfault when invoked from error(char *msg) function. CoInterpreter: No longer inline CoInterpreter>>pre/postGCAction: for VM profiling. Fix instantiation of large non-byte objects. The old code for sufficientSpaceToInstantiate:indexableSize: stupidly subtracted BytesPerWord instead of ShiftForWord from LongSizeNumBits in determining the max size. Garbage collect/remap the primTraceLog correctly. If a GC happens very early in start-up the log circular buffer may not be full and the existing code assumed it always was. Add Spur-specific interpreter proxy functions for immediate character and pinning access. Implement the new Spur interpreterProxy API for ObjectMemory (of course pinObject: fails, and isCharacterValue: has a smaller range). Fix a bug in printing frame flags (order was the wrong way around). Allow vmParameterAt: 26 put: 0 to disable the heartbeat itimer. Add AioPlugin to Mac VMs. Make CoInterpreter>>printFrame: not mislead as to the number of temps in a block activation. Change the time primitives to access the time now, not the time as updated by the heartbeat (but /don't/ change the time basis for event checking. This for performance because use of gettimeofday in e.g. stack overflow can be a signficant performance overhead. Move the simulated time implementations (ioSeconds et al) up to StackInterpreter to reduce duplication. Add ioSecondsNow et al to the platform code to support this. Fix regression in primitiveUtcWithOffset, answer the correct local time offset. Fix ioSecondsNow to use the time now, not the heartbeat time. Revamp primitiveVMParameter to avoid overflow in values such as total heap size. Make statProcessSwitch, statIOProcessEvents, statForceInterruptCheck, statCheckForEvents, statStackOverflow & statStackPageDivorce 64-bit to avoid wrapping. Make sure that positive64BitIntegerFor: will not cause a GC just as positive32BitIntegerFor: doesn't. Make primitiveClone cope with variable args, cloning its last argument. This for the Newspeak VMMirror. Add primitiveAllObjects, adapted from VMMaker-dtl.339.mcz Add Nicolas Cellier's bitblt speedups, reference: Mantis issue 7802: Fast-up BitBlt rgbAdd rule Mantis issue 7803: Fast-up BitBlt alpha blending rules Check for valid bitmap in primitivePixelValueAt aka BitBltSimulation>> primitivePixelValueAtX:y: Fix provided by Nicolas Cellier. Reference Mantis 7799 Avoid including the instructionPointer in the context when marrying the top frame during divorceAllFrames for voidVMState..If:. (how did this ever work??) Fix a bug in BitBltPlugin>>lockSurfaces. Add the compression prims to the Newspeak VM's ZipPlugin. Fix roomToPushNArgs:; the Cog VMs can be more lenient because of the use of a stack instead of contexts. Fixes some valueWithArguments: failures. Integrate Nice's improved SmallInteger generated primitives that support int x float comparison, & hence speed-up int x float comparison enormously. Integrate VMMaker-dtl.328 (failure of primitiveDisplayString to advance destX). Integrate 2792, fix memory leaks in SqueakSSL on unix. Integrate VMMaker-tpr.325 7247: BitBlt Bug in alphaSourceBlendBits8. Integrate VMMaker-tpr.326, Fix a single-bit constant error in BitBltSimulation>>copyBits:Fallback: - change 16r3FFF to 16r7FFF to correct tallyIntoMap behaviour for Scratch using BenBlt on the Pi. Restrict at-cache to bytecodePrimAt[Put], eliminating it from primitive[String]At[Put]. Sionara the explicit noAtCache at:[put:] machinery in CoInterpreter now that the atCache is confined to the interpreter's special selector at:[put:] bytecodes. Speeds up Stack VM signfiicantly, e.g. a compile of Compiler package falls from 1.6s to 1.4s on 2.2GHz Intel Core i7 MacBook Pro. Restrict at-cache to bytecodePrimAt[Put], eliminating it from primitive[String] At[Put]. Undoes need for fix in VMMaker-oscog.44 of 7 January 2011: "Fix leaking of objects into the atCache due to ceSend:super:to:numArgs:'s use of executeNewMethod without always setting messageSelector." This renders messageSelector and lkupClass ephemeral, since they are live only during message lookup and because createActualMessageTo will not cause a GC these cannot change during message lookup. Hence eliminate them from markAndTraceInterpreterOops: & mapVMRegisters. Fix arg count for primPCREExecfromto Cogit: Streamline the genPrimReturnEnterCogCodeEnilopmart. Streamline genExternalizePointersForPrimitiveCall Have StackToRegisterMappingCogit>>genPushReceiverBytecode use ReceiverResultReg if it contains self. Fix a double free bug in unlinkSendsOf:isMNUSelector:. Harmless cuz the result is only a bogus count of how many methods freed. Beef up the cog method integrity check to verify a its methodObject is a CompiledMethod. Fix bug in unlinkSendsOf:isMNUSelector: (primitiveFlushCacheBySelector) where old code could free the method of an active frame. Fix an assert fail in mapFor:bcpc:performUntil:arg: (this for primitiveClass where the class table reference can be the first map entry). Fix a bug in Newspeak remapIfObjectRef:pc:hasYoung: with dynamic super sends which could compute an invalid target method. Rename pushExplicitOuterSendReceiverBytecode et al to pushExplicitOuterReceiverBytecode et al. These are not sends. Fix pc-mapping for NewspeakV4. Dynamic super sends should /not/ be annotated with IsNSSendCall, but wth the vanilla IsSendCall. This fixes a bug converting an interpreter activation of a method with a loop and a dynamic super send to a machine code frame. For performance, specify that mapFor:[bcpc:]performUntil:arg: are inlined, eliminating the perform/indirect function call. This adds of the order of 3% to the size of a cogit.o's text seg so is acceptable. Print (nil) next to the selector for cog methods with a nil selector. Fix bug in Cogit>>unlinkSendsOf:isMNUSelector:, used by primitiveFlushCacheBySelector. The method could leave sends linked to freed MNU PICs. -- best, Eliot

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Re: [squeak-dev] The Inbox: ToolBuilder-Morphic-mt.92.mcz
by Tobias Pape 15 Jun '14

15 Jun '14

Any objections to me moving this patch-set to trunk? Best -Tobias On 15.06.2014, at 06:49, commits(a)source.squeak.org wrote: > A new version of ToolBuilder-Morphic was added to project The Inbox: > http://source.squeak.org/inbox/ToolBuilder-Morphic-mt.92.mcz > > ==================== Summary ==================== > > Name: ToolBuilder-Morphic-mt.92 > Author: mt > Time: 15 June 2014, 8:49:17.404 am > UUID: afad358c-8192-f54c-b472-e89b457071de > Ancestors: ToolBuilder-Morphic-fbs.91 > > Added support for pluggable scroll panes as introduced in ToolBuilder-Kernel-mt.61 > > =============== Diff against ToolBuilder-Morphic-fbs.91 =============== > > Item was added: > + ----- Method: MorphicToolBuilder>>buildPluggableScrollPane: (in category 'widgets optional') ----- > + buildPluggableScrollPane: spec > + > + | widget | > + widget := self scrollPaneClass new. > + widget model: spec model. > + self register: widget id: spec name. > + > + spec children > + ifNotNil: [:obj | > + "Create panel morph to scroll it." > + widget morph: (self pluggablePanelSpec new > + children: obj; > + layout: spec layout; > + frame: (0@0 corner: 1@1); > + buildWith: self). > + spec layout ~~ #proportional ifTrue: [ > + "Fix #spaceFill resizing because it does not make sense in scroll pane." > + widget morph > + hResizing: #shrinkWrap; > + vResizing: #shrinkWrap. > + widget morph submorphsDo: [:m | > + m > + extent: 100@100; > + flag: #refactor; "mt: Restore orginial properties?" > + hResizing: #rigid; > + vResizing: #rigid] > + ]] > + ifNil: [spec morph > + ifNotNil: [:m | widget morph: m] > + ifNil: [widget morphClass: spec morphClass]]. > + > + self setFrame: spec frame in: widget. > + parent ifNotNil: [self add: widget to: parent]. > + > + widget borderWidth: spec borderWidth. > + > + spec hScrollBarPolicy caseOf: { > + [#always] -> [widget alwaysShowHScrollBar: true]. > + [#never] -> [widget hideHScrollBarIndefinitely: true]. > + [#whenNeeded] -> [widget showHScrollBarOnlyWhenNeeded: true]}. > + spec vScrollBarPolicy caseOf: { > + [#always] -> [widget alwaysShowVScrollBar: true]. > + [#never] -> [widget hideVScrollBarIndefinitely: true]. > + [#whenNeeded] -> [widget showVScrollBarOnlyWhenNeeded: true]}. > + > + ^ widget! > > Item was added: > + ----- Method: MorphicToolBuilder>>scrollPaneClass (in category 'widget classes') ----- > + scrollPaneClass > + ^ PluggableScrollPane! > >

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The Trunk: Kernel-dtl.856.mcz
by commits＠source.squeak.org 15 Jun '14

15 Jun '14

David T. Lewis uploaded a new version of Kernel to project The Trunk: http://source.squeak.org/trunk/Kernel-dtl.856.mcz ==================== Summary ==================== Name: Kernel-dtl.856 Author: dtl Time: 15 June 2014, 10:42:28.524 am UUID: 5a0967c5-86ae-4631-9d20-d960cd97abb1 Ancestors: Kernel-cmm.855 Fix inconsistent image state as reported on squeak-dev: Date: Wed, 11 Jun 2014 23:44:42 -0400 From: Florin Mateoc To: The general-purpose Squeak developers list Subject: [squeak-dev] Class subclasses I think this is an old bug, presumably since ProtoObject was introduced (and presumably because ObjectTracer was used in the process). If you ask Class for its subclasses (or if you inspect it) you see that ObjectTracer class is listed along with ProtoObject class, although ObjectTracer's superclass is ProtoObject. This can lead to some funny bugs if you try to write some hierarchy traversing code. =============== Diff against Kernel-cmm.855 =============== Item was added: + ----- Method: ObjectTracer class>>initialize (in category 'initialize-release') ----- + initialize + "Fix for inconsistent image state in which ObjectTracer improperly appears as a subclass + of Class. This initialization should appear in the Squeak update stream in order to repair + existing images, and may be removed in a future update." + + Class removeSubclass: ObjectTracer class!

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The Inbox: ToolBuilder-Morphic-mt.92.mcz
by commits＠source.squeak.org 15 Jun '14

15 Jun '14

A new version of ToolBuilder-Morphic was added to project The Inbox: http://source.squeak.org/inbox/ToolBuilder-Morphic-mt.92.mcz ==================== Summary ==================== Name: ToolBuilder-Morphic-mt.92 Author: mt Time: 15 June 2014, 8:49:17.404 am UUID: afad358c-8192-f54c-b472-e89b457071de Ancestors: ToolBuilder-Morphic-fbs.91 Added support for pluggable scroll panes as introduced in ToolBuilder-Kernel-mt.61 =============== Diff against ToolBuilder-Morphic-fbs.91 =============== Item was added: + ----- Method: MorphicToolBuilder>>buildPluggableScrollPane: (in category 'widgets optional') ----- + buildPluggableScrollPane: spec + + | widget | + widget := self scrollPaneClass new. + widget model: spec model. + self register: widget id: spec name. + + spec children + ifNotNil: [:obj | + "Create panel morph to scroll it." + widget morph: (self pluggablePanelSpec new + children: obj; + layout: spec layout; + frame: (0@0 corner: 1@1); + buildWith: self). + spec layout ~~ #proportional ifTrue: [ + "Fix #spaceFill resizing because it does not make sense in scroll pane." + widget morph + hResizing: #shrinkWrap; + vResizing: #shrinkWrap. + widget morph submorphsDo: [:m | + m + extent: 100@100; + flag: #refactor; "mt: Restore orginial properties?" + hResizing: #rigid; + vResizing: #rigid] + ]] + ifNil: [spec morph + ifNotNil: [:m | widget morph: m] + ifNil: [widget morphClass: spec morphClass]]. + + self setFrame: spec frame in: widget. + parent ifNotNil: [self add: widget to: parent]. + + widget borderWidth: spec borderWidth. + + spec hScrollBarPolicy caseOf: { + [#always] -> [widget alwaysShowHScrollBar: true]. + [#never] -> [widget hideHScrollBarIndefinitely: true]. + [#whenNeeded] -> [widget showHScrollBarOnlyWhenNeeded: true]}. + spec vScrollBarPolicy caseOf: { + [#always] -> [widget alwaysShowVScrollBar: true]. + [#never] -> [widget hideVScrollBarIndefinitely: true]. + [#whenNeeded] -> [widget showVScrollBarOnlyWhenNeeded: true]}. + + ^ widget! Item was added: + ----- Method: MorphicToolBuilder>>scrollPaneClass (in category 'widget classes') ----- + scrollPaneClass + ^ PluggableScrollPane!

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The Inbox: ToolBuilder-Kernel-mt.61.mcz
by commits＠source.squeak.org 15 Jun '14

15 Jun '14

A new version of ToolBuilder-Kernel was added to project The Inbox: http://source.squeak.org/inbox/ToolBuilder-Kernel-mt.61.mcz ==================== Summary ==================== Name: ToolBuilder-Kernel-mt.61 Author: mt Time: 15 June 2014, 8:48:22.829 am UUID: 498679be-1699-544a-ab30-ad0691dcfb4e Ancestors: ToolBuilder-Kernel-nice.60 Added support for pluggable scroll panes to tool builder as introduced in Morphic-mt.722 =============== Diff against ToolBuilder-Kernel-nice.60 =============== Item was added: + PluggableCompositeSpec subclass: #PluggableScrollPaneSpec + instanceVariableNames: 'morph morphClass borderWidth vScrollBarPolicy hScrollBarPolicy' + classVariableNames: '' + poolDictionaries: '' + category: 'ToolBuilder-Kernel'! Item was added: + ----- Method: PluggableScrollPaneSpec>>borderWidth (in category 'accessing') ----- + borderWidth + + ^ borderWidth ifNil: [1]! Item was added: + ----- Method: PluggableScrollPaneSpec>>borderWidth: (in category 'accessing') ----- + borderWidth: anObject + + borderWidth := anObject! Item was added: + ----- Method: PluggableScrollPaneSpec>>buildWith: (in category 'building') ----- + buildWith: builder + + ^ builder buildPluggableScrollPane: self! Item was added: + ----- Method: PluggableScrollPaneSpec>>hScrollBarPolicy (in category 'accessing') ----- + hScrollBarPolicy + + ^ hScrollBarPolicy ifNil: [#always]! Item was added: + ----- Method: PluggableScrollPaneSpec>>hScrollBarPolicy: (in category 'accessing') ----- + hScrollBarPolicy: anObject + "#always, #never, #whenNeeded" + + hScrollBarPolicy := anObject! Item was added: + ----- Method: PluggableScrollPaneSpec>>morph (in category 'accessing') ----- + morph + + ^ morph! Item was added: + ----- Method: PluggableScrollPaneSpec>>morph: (in category 'accessing') ----- + morph: anObject + + morph := anObject! Item was added: + ----- Method: PluggableScrollPaneSpec>>morphClass (in category 'accessing') ----- + morphClass + + ^ morphClass! Item was added: + ----- Method: PluggableScrollPaneSpec>>morphClass: (in category 'accessing') ----- + morphClass: anObject + + morphClass := anObject! Item was added: + ----- Method: PluggableScrollPaneSpec>>vScrollBarPolicy (in category 'accessing') ----- + vScrollBarPolicy + + ^ vScrollBarPolicy ifNil: [#always]! Item was added: + ----- Method: PluggableScrollPaneSpec>>vScrollBarPolicy: (in category 'accessing') ----- + vScrollBarPolicy: anObject + "#always, #never, #whenNeeded" + + vScrollBarPolicy := anObject! Item was added: + ----- Method: ToolBuilder>>buildPluggableScrollPane: (in category 'widgets optional') ----- + buildPluggableScrollPane: spec + + ^ spec children + ifNotNil: [self buildPluggablePanel: spec] + ifNil: [spec morph ifNil: [spec morphClass new]]! Item was added: + ----- Method: ToolBuilder>>pluggableScrollPaneSpec (in category 'defaults') ----- + pluggableScrollPaneSpec + ^ PluggableScrollPaneSpec!

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The Inbox: Morphic-mt.722.mcz
by commits＠source.squeak.org 15 Jun '14

15 Jun '14

A new version of Morphic was added to project The Inbox: http://source.squeak.org/inbox/Morphic-mt.722.mcz ==================== Summary ==================== Name: Morphic-mt.722 Author: mt Time: 15 June 2014, 8:46:55.467 am UUID: 0ec07e17-be8b-4c41-87fa-8d837327f6bd Ancestors: Morphic-cmm.721 Added pluggable version of scroll pane to be used in tool builder. =============== Diff against Morphic-cmm.721 =============== Item was added: + ScrollPane subclass: #PluggableScrollPane + instanceVariableNames: 'morph morphClass' + classVariableNames: '' + poolDictionaries: '' + category: 'Morphic-Pluggable Widgets'! Item was added: + ----- Method: PluggableScrollPane class>>on: (in category 'instance creation') ----- + on: morph + + ^ self new + morph: morph; + yourself! Item was added: + ----- Method: PluggableScrollPane class>>onClass: (in category 'instance creation') ----- + onClass: morphClass + + ^ self new + morphClass: morphClass; + updateMorph; + yourself! Item was added: + ----- Method: PluggableScrollPane>>morph (in category 'accessing') ----- + morph + + ^ morph ifNil: [ + self morph: self morphClass new. + morph]! Item was added: + ----- Method: PluggableScrollPane>>morph: (in category 'accessing') ----- + morph: morphToScroll + + morphToScroll topLeft: 0@0. + morph := morphToScroll. + morphClass := morphToScroll class. + + self scroller + removeAllMorphs; + addMorph: morph. + + self updateMorph.! Item was added: + ----- Method: PluggableScrollPane>>morphClass (in category 'accessing') ----- + morphClass + + ^ morphClass ifNil: [Morph]! Item was added: + ----- Method: PluggableScrollPane>>morphClass: (in category 'accessing') ----- + morphClass: aMorphClass + + morphClass := aMorphClass.! Item was added: + ----- Method: PluggableScrollPane>>updateMorph (in category 'updating') ----- + updateMorph + + self morph fullBounds. + self setScrollDeltas. + + scrollBar setValue: 0.0. + hScrollBar setValue: 0.0.!

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[ANN] FunSqueak 4.6 build first report
by Edgar De Cleene 14 Jun '14

14 Jun '14

http://squeakros.org/FunSqueak4.6/ScreenSnapz.jpg Here you could see first picture. Until now, load Altitude,MorphicWrappers and MathMorphs, IRC, Kom,some OLPC projects from kids in https://www.hpi.uni-potsdam.de/hirschfeld/projects/olpc/index.html, classic Morphic Games. Trying to load Tweak, but 4.6 needs pre requisites which Sophie or http://sdk.krestianstvo.org/sdk/tweak45.html have. So we need some coordinate Tweak update. Edgar

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new Cog VMs available
by Eliot Miranda 14 Jun '14

14 Jun '14

...in http://www.mirandabanda.org/files/Cog/VM/VM.r3000/ CogVM binaries as per VMMaker.oscog-eem.772/r3000 Add libcrypto and libssl to Linux and Mac builds of the SqueakSSL plugin. Add the XDisplayControlPlugin and include it (external) and the AioPlugin (internal) to the linux x86 builds. Cog: Fix an abort (relocating call to invalid address) due to an over-zealous check in relocateCallBeforeReturnPC:by:. Since we relocate e.g. calls to primitives there can be no effective range check there-in. Spur: Fix fillObj: signedness for objects straddling the midpoint of the address space (quickly affects linux). Similarly for routines in pigCompact, to get asserts correct. Fix printOopsFrom:to:. for objects up to endOfMemory. Declare lastFreeChunk and firstFreeChunk correctly. Fix numberOfForwarders: and printForwarders: for isForwarded:'s blindness towards freeChunks. Comment isForwarded: to be clear on the issue. Have the segment manager pass to sqAllocateMemorySegmentOfSize: the address of the first large enough gap in the address space, instead of the address of the end of the first segment. This allows e.g. linux to use MAP_FIXED and hence get past a 128Mb limit on mmapping. Fix bugs in isValidFreeObject: & printFreeTreeChunk: that caused bogus assert failures. Remember to include the Spur moniker in the -version output on linux -- best, Eliot

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Fake Guru Hamid Arabnia and bogus WORLDCOMP and CSCI
by jermy23＠hushmail.com 14 Jun '14

14 Jun '14

Fake Guru Hamid Arabnia and bogus WORLDCOMP and CSCI If you have any thought of attending the world’s biggest fake or bogus conference in computer science, WORLDCOMP http://www.world-academy-of-science.org you must visit any websites below https://sites.google.com/site/worlddump1 or https://sites.google.com/site/dumpconf https://sites.google.com/site/moneycomp1 https://sites.google.com/site/worlddump4 The organizer of this conference is Hamid Arabnia http://www.cs.uga.edu/~hra a professor from University of Georgia, USA. The primary goal of this conference is to collect registration fee by accepting all submitted papers. Several fake papers were published in the conference proceedings. He already earned millions of dollars from the registration fee and is using part of the money for anti-Christmas greetings campaign. http://worldcomp-fake-bogus.blogspot.com has additional information on this campaign. He recently started another new conference CSCI due to his hunger for money http://www.americancse.org Hamid Arabnia failed to reveal the reviews and reviewers' information for all the papers he received, despite repeated requests and challenges. The reason for his failure is there were no reviews and reviewers and he just cheated the research community for more than a decade by announcing that each draft paper is reviewed by two experts. We challenge him to publish these details at the conference website. Where are these experts? Where are these reviews? He pays tens of thousands of dollars and brings keynote speakers and project his conference as a great one. He lists the names of current and former keynote speakers on the front page of the conference and use those names as baits to attract paper submissions from innocent researchers. He always conducts the conferences in the “sin city” to attract people who prefer “other” activities. DBLP stopped indexing these conferences since 2011 and displayed an explicit message; The DBLP Advisory Board decided to discontinue indexing of this conference series. Visit http://www.informatik.uni-trier.de/~ley/db/conf/biocomp/index.html as a sample. He was forced to remove his name, the university of Georgia name, and university of Georgia email address from the conference’s contact page because the University has banned him from doing that. He is running the conference behind the scenes and there is no coordinator or general chair listed for this conference. Almost every week (until the conference date is so close), Hamid Arabnia updates the conference website with things like this: You are invited to submit a "Late Breaking Paper", "Position Paper", "Abstract/Poster Paper" or “Abstract of Thesis or Dissertation” for consideration, etc. He wants more papers because each paper generates around 500 US dollars in to his pocket. Additional information on this conference bogus conference is available by searching internet using the keywords worldcomp fake or Hamid Arabnia fake Apologies for posting to multiple mailing lists. Spreading the word is the only way to stop this conference from cheating innocent researchers.

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