Reduce effective memory size on benchmark client.

Lock memory to reduce the amount available for the NFS file cache, so
that requests will go the proxy.

diff --git a/microbench/setup/run-benchmark b/microbench/setup/run-benchmark
index bf061a4..422ae05 100755 (executable)
--- a/microbench/setup/run-benchmark
+++ b/microbench/setup/run-benchmark
@@ -14,6 +14,18 @@ BENCH_THREADS=8
 BENCH_DURATION=120
 BENCH_OPS=100
 BENCH_INTERVALS=4
+BENCH_LOCKEDMEM=$((4096 - 256))
+
+lock_memory() {
+    MEM=$1
+    while [ $MEM -gt 512 ]; do
+        /scratch/bluesky.git/microbench/lockmem 512 &
+        MEM=$(($MEM - 512))
+    done
+    if [ $MEM -gt 0 ]; then
+        /scratch/bluesky.git/microbench/lockmem $MEM &
+    fi
+}
 
 # Export any environment variables specified on the command line
 for e in "$@"; do
@@ -25,6 +37,8 @@ for e in "$@"; do
 done
 
 # Prepare to run the benchmark
+lock_memory $BENCH_LOCKEDMEM
+
 mount -t nfs -o vers=3,tcp,rw,soft,intr $SERVER:/export $MNTDIR
 
 pushd $MNTDIR >/dev/null
@@ -38,6 +52,8 @@ pushd $MNTDIR >/dev/null
     $BENCH_OPS \
     $BENCH_INTERVALS
 
+pkill -TERM lockmem
+
 popd >/dev/null
 
 umount -f $MNTDIR