Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 07/33] perf tests: Fixes hang in zstd compression test by changing the source of random data | Date | Mon, 26 Aug 2019 22:36:08 -0300 |
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From: James Clark <James.Clark@arm.com>
Running 'perf test' with zstd compression linked will hang at the test 'Zstd perf.data compression/decompression' because /dev/random blocks reads until there is enough entropy. This means that the test will appear to never complete unless the mouse is continually moved while running it.
Signed-off-by: James Clark <james.clark@arm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexey Budankov <alexey.budankov@linux.intel.com> Cc: Jeremy Linton <jeremy.linton@arm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/3d8cc701-df4e-f949-1715-5118b530e990@arm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/tests/shell/record+zstd_comp_decomp.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/tests/shell/record+zstd_comp_decomp.sh b/tools/perf/tests/shell/record+zstd_comp_decomp.sh index 899604d17b85..63a91ec473bb 100755 --- a/tools/perf/tests/shell/record+zstd_comp_decomp.sh +++ b/tools/perf/tests/shell/record+zstd_comp_decomp.sh @@ -13,7 +13,7 @@ skip_if_no_z_record() { collect_z_record() { echo "Collecting compressed record file:" $perf_tool record -o $trace_file -g -z -F 5000 -- \ - dd count=500 if=/dev/random of=/dev/null + dd count=500 if=/dev/urandom of=/dev/null } check_compressed_stats() { -- 2.21.0
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