[Vm-dev] Cog: invalid nanosleep argument (i.e. socket errors)

[Igor Stasenko]

Thanks a lot!

On 16 August 2010 19:22, Lukas Renggli <renggli at gmail.com> wrote:
>
>> Lukas, could you share details how you simulating heavy load?
>> I know there are some tools on linux to flood server with HTTP
>> requests , but i never
>> used it myself.
>
> I used 'ab', the Apache HTTP server benchmarking tool. That works out
> of the box on any machine with Apache installed and additionally gives
> a nice performance report. In this case however I just wanted to
> generate load to crash the VM (which I didn't manage).
>
> For this test I used the following code using a single session I
> created beforehand in the web browser.
>
>   ab -n 1000 -c 10
> "http://127.0.0.1:8080/tests/functional/WAHtml5ElementsTest?_s=As2WXbb5pqm18xuy&_k=IbUsjDo1UIRR-SeI"
>
> Another easy thing to do is to fork multiple instances of 'wget' and
> tell it to randomly browse through the links of a web application.
>
>   wget --recursive --no-parent --delete-after
> "http://127.0.0.1:8081/examples/multicounter"
>
> Each of the started processes then clicks through an individual
> session. It is important to disable the toolbar, otherwise 'wget'
> starts to mess around with your image (through the configuration).
>
> Previously I've also used JMeter. This tool is much more controllable
> and can be scripted to click through an application in a predefined
> way, but it also means a lot more work to setup.
>
> Lukas
>
> On 16 August 2010 17:32, Igor Stasenko <siguctua at gmail.com> wrote:
>>
>> On 16 August 2010 16:48, Lukas Renggli <renggli at gmail.com> wrote:
>>>
>>> Thank you! I can confirm that this solves the last remaining Seaside issue.
>>>
>>> I simulated some heavy parallel requests on a Cog-Seaside image and it
>>> doesn't crash anymore.
>>>
>>
>> Lukas, could you share details how you simulating heavy load?
>> I know there are some tools on linux to flood server with HTTP
>> requests , but i never
>> used it myself.
>>
>>
>>> Lukas
>>>
>>> On 13 August 2010 21:20, Eliot Miranda <eliot.miranda at gmail.com> wrote:
>>>>
>>>> Thanks Henrik!!
>>>>
>>>> On Fri, Aug 13, 2010 at 7:38 AM, Henrik Johansen <henrik.s.johansen at veloxit.no> wrote:
>>>>>
>>>>>
>>>>> I think I figured out why Cog some times terminates when downloading large files on OSX;
>>>>> An oversleep which is interrupted can be returned as a t_time struct with tv_sec -1 and tv_nsec close to 999999999.
>>>>>
>>>>> The while check is
>>>>> nanosleep (&naptime, &naptime) == -1 && naptime.tv_sec > 0 1|| naptime.tv_nsec > MINSLEEPNS
>>>>>
>>>>> or so, so when an interrupt is encountered which has tv_sec = -1, you will get the invalid argument error.
>>>>>
>>>>> rewriting it to
>>>>> naptime.tvsec > -1 && naptime.tv_nsec > MINSLEEPNS && nanosleep(&naptime, &naptime) == -1
>>>>>
>>>>> I no longer had  crashes in 99% of hte cases when evaluating the following test:
>>>>>
>>>>> HTTPSocket httpGetDocument: 'http://www.squeaksource.com/Pharo/Morphic-stephane_ducasse.334.mcz'.
>>>>>
>>>>> I've attached the sqUnixHeartbeat.c.
>>>>>
>>>>> Cheers,
>>>>> Henry
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Lukas Renggli
>>> www.lukas-renggli.ch
>>>
>>
>>
>>
>> --
>> Best regards,
>> Igor Stasenko AKA sig.
>>
>
>
>
> --
> Lukas Renggli
> www.lukas-renggli.ch
>



-- 
Best regards,
Igor Stasenko AKA sig.