From 283a04296959cca9e4d6fe57c20b09aecb6c6178 Mon Sep 17 00:00:00 2001
From: Mark Callaghan <mdcallag@gmail.com>
Date: Thu, 23 Apr 2015 09:18:25 -0700
Subject: [PATCH] Set --seed per test

Summary:
This is done to avoid having each thread use the same seed between runs
of db_bench. Without this we can inflate the OS filesystem cache hit rate on
reads for read heavy tests and generally see the same key sequences get generated
between teste runs.

Task ID: #

Blame Rev:

Test Plan:
Revert Plan:

Database Impact:

Memcache Impact:

Other Notes:

EImportant:

- begin *PUBLIC* platform impact section -
Bugzilla: #
- end platform impact -

Reviewers: igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D37563
---
 tools/benchmark.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/benchmark.sh b/tools/benchmark.sh
index 8aef4bd92..511817a11 100755
--- a/tools/benchmark.sh
+++ b/tools/benchmark.sh
@@ -138,6 +138,7 @@ function run_bulkload {
        --threads=1 \
        --memtablerep=vector \
        --disable_wal=1 \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/benchmark_bulkload_fillrandom.log"
   echo $cmd | tee $output_dir/benchmark_bulkload_fillrandom.log
   eval $cmd
@@ -166,6 +167,7 @@ function run_fillseq {
        --threads=1 \
        --memtablerep=vector \
        --disable_wal=1 \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/benchmark_fillseq.v${value_size}.log"
   echo $cmd | tee $output_dir/benchmark_fillseq.v${value_size}.log
   eval $cmd
@@ -182,6 +184,7 @@ function run_change {
        $params_w \
        --threads=$num_threads \
        --merge_operator=\"put\" \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/${out_name}"
   echo $cmd | tee $output_dir/${out_name}
   eval $cmd
@@ -195,6 +198,7 @@ function run_filluniquerandom {
        --sync=0 \
        $params_w \
        --threads=1 \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/benchmark_filluniquerandom.log"
   echo $cmd | tee $output_dir/benchmark_filluniquerandom.log
   eval $cmd
@@ -208,6 +212,7 @@ function run_readrandom {
        --use_existing_db=1 \
        $params_w \
        --threads=$num_threads \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/${out_name}"
   echo $cmd | tee $output_dir/${out_name}
   eval $cmd
@@ -225,6 +230,7 @@ function run_readwhile {
        --threads=$num_threads \
        --writes_per_second=$writes_per_second \
        --merge_operator=\"put\" \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/${out_name}"
   echo $cmd | tee $output_dir/${out_name}
   eval $cmd
@@ -246,6 +252,7 @@ function run_rangewhile {
        --merge_operator=\"put\" \
        --seek_nexts=$num_nexts_per_seek \
        --reverse_iterator=$reverse_arg \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/${out_name}"
   echo $cmd | tee $output_dir/${out_name}
   eval $cmd
@@ -263,6 +270,7 @@ function run_range {
        --threads=$num_threads \
        --seek_nexts=$num_nexts_per_seek \
        --reverse_iterator=$reverse_arg \
+       --seed=$( date +%s ) \
        2>&1 | tee -a $output_dir/${out_name}"
   echo $cmd | tee $output_dir/${out_name}
   eval $cmd