<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr">Hi Christoph,</div><div dir="ltr"><br><blockquote type="cite">On Jan 11, 2022, at 5:21 AM, Thiede, Christoph <Christoph.Thiede@student.hpi.uni-potsdam.de> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<p>Hi all,</p>
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<p>I am running some performance benchmarks using #timeToRunWithoutGC via smalltalkCI on GitHub Actions (Ubuntu) and am observing a very high standard deviation of the results. I suppose that GitHub is temporarily suspending my workflow for reasons. Is my assumption
correct that such suspensions would *not* be transparent to <span>primitiveUTCMicrosecondClock, which acts similar to a wall clock? Does the VM provide any means to measure the time that was actually spent inside the VM process? I believe I am searching for
an equivalent of the linux time command where I would sum up user + system time (because expensive I/O calls from my benchmarked code are indeed relevant) and then subtract the GC time. Is there already any support for this in the VM, or would this require
major efforts?</span></p></div></div></blockquote><div><br></div>The VM does maintain an idle time, accessible via vmParameterAt: . Use the About Squeak’s VM parameters tab to find out which it is. The idle time gets incremented in relinquishProcessorForMicroseconds: from the idleProcess.<div><br></div><div>There’s a thread on squeak-dev or vm-dev from perhaps five years ago by Ryan Macnak suggesting that the vm maintain an active time rather than an idle time, and that it be hooked into sleep events. I think this is a good idea but I don’t have cycles to implement it, so the idle time is what we have at the moment. <br><blockquote type="cite"><div dir="ltr"><div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif;" dir="ltr">
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<p><span>Thanks in advance!</span></p>
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<p><span>Best,</span></p>
<p><span>Christoph</span></p>
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