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So, I've been looking to get kernel shark onto gentoo, |
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for a long time....[1] Look at this link to wet your |
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appetite! |
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KernelShark(gui) is a very, very functional way to look at just about |
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every aspect of kernel performance. It needs trace-cmd to run. |
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Guess what just made it into the portage tree? |
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(dev-util/trace-cmd) THANKS to Patrick McLean <chutzpah@g.o>! |
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You'll have to make some adjustments to your kernel settings (maybe) |
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to activate ftrace. |
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I wrote extensively about KernelShark/trace-cmd/ftrace in this bug, |
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which is still looking for a gentoo dev to complete (please?). |
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BGO 517428. |
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Now to wet those appetites, look here [2,3] at section 3.7 and 3.8. |
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It seems our 'pals' at RedHat offer there most optimized servers |
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that are extremely tweaked in the kernel (real-time) by using these |
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tools; particularly for their cluster offerings that cost big_bucks. |
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[2] |
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https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_ |
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MRG/1.3/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide- |
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Realtime_Specific_Tuning-Using_the_ftrace_Utility_for_Tracing_Latencies.html |
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[3] |
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https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_ |
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MRG/1.3/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide- |
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Realtime_Specific_Tuning-Latency_Tracing_Using_trace_cmd.html |
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|
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MRG (messaging, realtime, grid) version guide 1.3 has tons of performance |
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tuning ideas for servers that are well worth a glance. If you just want |
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the pdf, search for: |
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|
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Red_Hat_Enterprise_MRG-1.3-Realtime_Tuning_Guide-en-US.pdf |
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KernelShark on top of trace-cmd using ftrace activated in the kernel, |
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is one bad ars tool; so as soon as some sympathetic dev (ebuild hacker) |
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puts together an ebuild (overlay is fine) for KernelShark, we be |
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jammin on da kernel optimizations! |
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It'll even allow folks to evaluate ram performance with a real timing |
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chart style data sets. |
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TEQUILA! for all my pals........ |
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enjoy, |
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James |
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repeated from BGO-517428! |
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[1] https://www.kernel.org/doc/Documentation/trace/ftrace.txt |
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[2] http://lwn.net/Articles/410200/ |
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[3] http://www.linux-kvm.org/page/Tracing |
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[4] http://git.kernel.org/cgit/linux/kernel/git/rostedt/trace-cmd.git |
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[5] http://rostedt.homelinux.com/kernelshark/ |
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[6] http://pkgs.org/download/kernelshark |
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[7] http://www.youtube.com/watch?v=ABRtzVtUVBo |
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[8] |
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http://crtags.blogspot.com/2012/04/dtrace-ftrace-ltrace-strace-so-many-to.html |
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[9] |
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https://wiki.linaro.org/LEG/Engineering/TOOLS/tracing-and-profiling-tools#ftrace |
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