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modifty sleepers to have easier evaluation of interaction between cpu freq scaling
and scheduler lock (pipe based or futex based) See http://www.valgrind.org/docs/manual/manual-core.html#manual-core.pthreads_perf_sched for background info about cpu freq scaling and valgrind thread scheduler. To reproduce the interaction, do: for sched in --fair-sched=yes --fair-sched=no do for affinity in 0 1 do echo $sched $affinity time ./vg-in-place $sched -q ./gdbserver_tests/sleepers 1000000 0 1000 B-B-B-B- $affinity done done which gives the below output (intel core i5-6402P, debian 8, kernel 3.16.0). In summary: the fair scheduler is fair, the pipe based scheduler can be really unfair (e.g. with --fair-sched=no and no affinity, 2 threads are finishing their work, while the 2 other threads are starting their work only after the first 2 have fully finished). The difference in timing is significant : 1m14s versus around 47 seconds. Note: If the governor is set to performance, strangely, the time needed for --fair-sched=no increases slighltly (to around 48 seconds). The time for --fair-sched=yes with or without affinity is then also to around 48 seconds. Below is timing with on-demand governor: --fair-sched=yes 0 loops/sleep_ms/burn/threads_spec/affinity: 1000000 0 1000 B-B-B-B- 0 Brussels ready to sleep and/or burn London ready to sleep and/or burn Petaouchnok ready to sleep and/or burn main ready to sleep and/or burn Brussels finished to sleep and/or burn London finished to sleep and/or burn Petaouchnok finished to sleep and/or burn main finished to sleep and/or burn real 1m14.582s user 1m14.348s sys 0m0.204s --fair-sched=yes 1 loops/sleep_ms/burn/threads_spec/affinity: 1000000 0 1000 B-B-B-B- 1 Brussels ready to sleep and/or burn London ready to sleep and/or burn Petaouchnok ready to sleep and/or burn main ready to sleep and/or burn main finished to sleep and/or burn Brussels finished to sleep and/or burn Petaouchnok finished to sleep and/or burn London finished to sleep and/or burn real 0m46.785s user 0m46.756s sys 0m0.032s --fair-sched=no 0 loops/sleep_ms/burn/threads_spec/affinity: 1000000 0 1000 B-B-B-B- 0 Brussels ready to sleep and/or burn Brussels finished to sleep and/or burn London ready to sleep and/or burn London finished to sleep and/or burn Petaouchnok ready to sleep and/or burn main ready to sleep and/or burn Petaouchnok finished to sleep and/or burn main finished to sleep and/or burn real 0m47.742s user 0m48.224s sys 0m0.084s --fair-sched=no 1 loops/sleep_ms/burn/threads_spec/affinity: 1000000 0 1000 B-B-B-B- 1 Brussels ready to sleep and/or burn London ready to sleep and/or burn Petaouchnok ready to sleep and/or burn main ready to sleep and/or burn Brussels finished to sleep and/or burn London finished to sleep and/or burn main finished to sleep and/or burn Petaouchnok finished to sleep and/or burn real 0m46.601s user 0m46.568s sys 0m0.036s git-svn-id: svn://svn.valgrind.org/valgrind/trunk@16251
This commit is contained in:
Philippe Waroquiers
parent
91e7677668
commit
d7ccda99e6
@ -1,4 +1,4 @@
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loops/sleep_ms/burn/threads_spec: 1 0 2000000000 ------B-
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loops/sleep_ms/burn/threads_spec/affinity: 1 0 2000000000 ------B- 1
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main ready to sleep and/or burn
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pid .... Thread .... inferior call pushed from gdb in mcinfcallRU.stdinB.gdb
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Reset valgrind output to log (orderly_finish)
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@ -2,7 +2,7 @@
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prog: sleepers
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# We would like to use B-B-B-B- instead of ------B- but this gives
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# too much dependencies to the scheduler fairness.
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args: 1 0 2000000000 ------B-
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args: 1 0 2000000000 ------B- 1
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vgopts: --tool=memcheck --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-mcinfcallRU
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# filter_gdb to replace pid and Thread numbers in the output of the program:
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stderr_filter: filter_gdb
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@ -1,4 +1,4 @@
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loops/sleep_ms/burn/threads_spec: 100 100000000 1000000000 -S-S-SB-
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loops/sleep_ms/burn/threads_spec/affinity: 100 100000000 1000000000 -S-S-SB- 1
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Brussels ready to sleep and/or burn
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London ready to sleep and/or burn
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Petaouchnok ready to sleep and/or burn
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@ -3,7 +3,7 @@
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prog: sleepers
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# We would like to have two threads running (i.e. -S-SB-B-)
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# but this introduces too much dependencies to scheduler fairness.
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args: 100 100000000 1000000000 -S-S-SB-
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args: 100 100000000 1000000000 -S-S-SB- 1
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vgopts: --tool=memcheck --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-mcinfcallWSRU
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# We need a non buggy gdb.step on arm thumb.
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# Disable on Darwin: inferior call rejected as it cannot find malloc.
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@ -1,7 +1,7 @@
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# test that vgdb can invoke a process when all threads are in Runnable or Yielding mode
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# If the test goes wrong, it might consume CPU during a long time.
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prog: sleepers
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args: 1 0 1000000000 B-B-B-B-
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args: 1 0 1000000000 B-B-B-B- 1
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vgopts: --tool=memcheck --vgdb=yes --vgdb-prefix=./vgdb-prefix-mcinvokeRU
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stderr_filter: filter_make_empty
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# as the Valgrind process is always busy, we do not need the vgdb.invoker prereq.
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@ -3,7 +3,7 @@ Nulgrind, the minimal Valgrind tool
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(action at startup) vgdb me ...
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loops/sleep_ms/burn/threads_spec: 1000000000 1000000000 1000000000 BSBSBSBS
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loops/sleep_ms/burn/threads_spec/affinity: 1000000000 1000000000 1000000000 BSBSBSBS 1
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Brussels ready to sleep and/or burn
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London ready to sleep and/or burn
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Petaouchnok ready to sleep and/or burn
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@ -9,7 +9,7 @@
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# This test is disabled on Solaris because modifying select/poll/ppoll timeout
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# has no effect if a thread is already blocked in that syscall.
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prog: sleepers
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args: 1000000000 1000000000 1000000000 BSBSBSBS
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args: 1000000000 1000000000 1000000000 BSBSBSBS 1
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vgopts: --tool=none --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-nlcontrolc
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stderr_filter: filter_stderr
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# Bug 338633 nlcontrol hangs on arm64 currently.
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@ -4,7 +4,7 @@
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# But if this signal is masked, then vgdb does not recuperate the control
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# and Valgrind dies. See function give_control_back_to_vgdb in m_gdbserver.c
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prog: sleepers
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args: 1 10000000 0 -S-S-S-S
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args: 1 10000000 0 -S-S-S-S 1
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vgopts: --tool=none --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-nlsigvgdb
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stderr_filter: filter_stderr
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prereq: test -e gdb -a -f vgdb.invoker
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@ -3,7 +3,7 @@ Nulgrind, the minimal Valgrind tool
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(action at startup) vgdb me ...
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loops/sleep_ms/burn/threads_spec: 1000000000 1000000000 1 BSBSBSBS
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loops/sleep_ms/burn/threads_spec/affinity: 1000000000 1000000000 1 BSBSBSBS 1
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Brussels ready to sleep and/or burn
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London ready to sleep and/or burn
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Petaouchnok ready to sleep and/or burn
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@ -3,7 +3,7 @@
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# vgdb must queue these signals and deliver them before PTRACE_DETACHing.
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# sleepers is started with argument so that it will mostly sleep.
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prog: sleepers
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args: 1000000000 1000000000 1 BSBSBSBS
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args: 1000000000 1000000000 1 BSBSBSBS 1
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vgopts: --tool=none --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-nlvgdbsigqueue
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stderr_filter: filter_stderr
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prereq: test -e gdb -a -f vgdb.invoker
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@ -137,7 +137,7 @@ int main (int argc, char *argv[])
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pthread_t ebbr, egll, zzzz;
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struct spec b, l, p, m;
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char *some_mem __attribute__((unused)) = malloc(100);
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setaffinity();
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if (argc > 5 && atoi(argv[5])) setaffinity();
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setup_sigusr_handler();
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if (argc > 1)
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loops = atoi(argv[1]);
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@ -153,8 +153,8 @@ int main (int argc, char *argv[])
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else
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threads_spec = "BSBSBSBS";
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fprintf(stderr, "loops/sleep_ms/burn/threads_spec: %d %d %d %s\n",
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loops, sleepms, burn, threads_spec);
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fprintf(stderr, "loops/sleep_ms/burn/threads_spec/affinity: %d %d %d %s %d\n",
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loops, sleepms, burn, threads_spec, argc > 5 && atoi(argv[5]));
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fflush(stderr);
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b.name = "Brussels";
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