We have some code that will attempt to set the priority of worker threads via pthread_setschedparam.
-----Original Message----- From: hlds_linux-boun...@list.valvesoftware.com [mailto:hlds_linux-boun...@list.valvesoftware.com] On Behalf Of Marco Padovan Sent: Saturday, September 29, 2012 10:38 AM To: hlds_linux@list.valvesoftware.com Subject: Re: [hlds_linux] srcds_linux changing its own process priority at start (centos) :D btw I hope someone from Valve will clarify about this behaviour so at least we can understand if making servers run as root "better but more expensive" is an intender behaviour and if there's a way around that to suppress this kind of "self changes tries" srcds_linux does :) Il 29/09/2012 19:20, Andre Müller ha scritto: > Next step: Run the srcds_linux in kernel mode: > http://web.yl.is.s.u-tokyo.ac.jp/~tosh/kml/ > > 2012/9/29 Marco Padovan <e...@evcz.tk>: >> you were right ... if you run it as root it make use of the realtime >> scheduler and set itself to -3 as priority... >> >> is this normal? >> >> "ZOMG running az r00t makes it quicker and faster, 100000fps here I >> come" :D >> >> Il 29/09/2012 19:03, Marco Padovan ha scritto: >>> Hi, >>> >>> thanks for your feedback, never run the server as root so I never >>> noticed this *weird* behaviour :S This specific unprivileged user >>> (/*not root*/) I'm doing the tests with is allowed to set realtime >>> scheduler for its own processes. >>> >>> Kernel is: 2.6.32-279.9.1.el6.x86_64 (official binary shipped by >>> centos) >>> >>> What I can't understand is why srcds_linux tries to do such change >>> on its own... If I wanted to see it make use of realtime scheduler I >>> would do that when starting... I do not like processes doing things >>> by their own :S >>> >>> Additionally this kind of behaviour would make people run the >>> gameservers as root because it will magically performs "better" >>> thanks to the automatic scheduler changes :O Are we opening a >>> Pandora's box? :D >>> >>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >>> 13660 testtf2 -3 0 288m 174m 19m S 9.6 1.5 0:10.58 srcds_linux >>> 13653 testtf2 20 0 103m 1568 1224 S 0.0 0.0 0:00.00 srcds_run >>> >>> >>> pid 13660's current scheduling policy: SCHED_RR pid 13660's current >>> scheduling priority: 2 >>> >>> pid 13653's current scheduling policy: SCHED_OTHER pid 13653's >>> current scheduling priority: 0 >>> >>> let me see what happens when running as root :) >>> >>> >>> >>> Il 29/09/2012 18:35, Ulrich Block ha scritto: >>>> Am 29.09.2012 18:30, schrieb Marco Padovan: >>>>> Hi, thanks for your reply. >>>>> >>>>> In my case it is not srcds_run doing that, it's srcds_linux that >>>>> does something. >>>>> >>>>> "priority" changes a few seconds after srcds_linux has started >>>>> (right after "create 4 threads" gets printed into the console log). >>>>> >>>>> In my case it's changing its own scheduling parameters moving from >>>>> the SCHED_OTHER into SCHED_RR. >>>> Which kernel are you using? And most importantly which user runs >>>> the server? I saw such a behaviour when someone was running >>>> everything with root. >>>> >>>> A normal system user should not have the permission to change the >>>> prio or the scheduling. The root user does. >>>> >>>> >>>> >>>> _______________________________________________ >>>> To unsubscribe, edit your list preferences, or view the list >>>> archives, please visit: >>>> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux >> _______________________________________________ >> To unsubscribe, edit your list preferences, or view the list archives, >> please visit: >> https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, please > visit: > https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds_linux
