Re: [Qemu-devel] [PATCH v4 26/35] tests: add atomic_add-bench
On 09/16/2016 04:54 PM, Emilio G. Cota wrote: On Fri, Sep 16, 2016 at 10:46:48 -0700, Richard Henderson wrote: From: "Emilio G. Cota" With this microbenchmark we can measure the overhead of emulating atomic instructions with a configurable degree of contention. The benchmark spawns $n threads, each performing $o atomic ops (additions) in a loop. Each atomic operation is performed on a different cache line (assuming lines are 64b long) that is randomly selected from a range [0, $r). [ Note: each $foo corresponds to a -foo flag ] Hi Richard, As I mentioned yesterday I have an updated version of this patch: http://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03450.html [ The major change is to run for a certain number of seconds, instead of a fixed number of operations. ] I'll send the full updated patch as a reply to this message to make it easier to pick up. Thanks, applied. r~
Re: [Qemu-devel] [PATCH v4 26/35] tests: add atomic_add-bench
On Fri, Sep 16, 2016 at 10:46:48 -0700, Richard Henderson wrote: > From: "Emilio G. Cota" > > With this microbenchmark we can measure the overhead of emulating atomic > instructions with a configurable degree of contention. > > The benchmark spawns $n threads, each performing $o atomic ops (additions) > in a loop. Each atomic operation is performed on a different cache line > (assuming lines are 64b long) that is randomly selected from a range [0, $r). > > [ Note: each $foo corresponds to a -foo flag ] Hi Richard, As I mentioned yesterday I have an updated version of this patch: http://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03450.html [ The major change is to run for a certain number of seconds, instead of a fixed number of operations. ] I'll send the full updated patch as a reply to this message to make it easier to pick up. Thanks, Emilio
