# Disk I/O Benchmarks

I have a tar file in http://sage.math.washington.edu/home/wstein/tmp/bench/, which is a sage-3.3.alpha3 build for sage.math.

The benchmark is to do the following tests, which reflect real-world usage that users of sage.math care about.

FILE=test_tar if [ -d $FILE ]; then echo "Deleting left around $FILE" rm -rf $FILE fi sync echo "Extract tarball" time tar xf $FILE.tar if [ $? -ne 0 ]; then exit 1 fi time sync echo "Remove tarball" time rm $FILE.tar if [ $? -ne 0 ]; then exit 1 fi time sync echo "Create tarball" time tar cf $FILE.tar $FILE if [ $? -ne 0 ]; then exit 1 fi time sync echo "Check size of tarball" time du -sh $FILE if [ $? -ne 0 ]; then exit 1 fi time sync echo "Find test" cd $FILE time find . -name sage_object.pyx -print cd .. if [ $? -ne 0 ]; then exit 1 fi time sync echo "Copy extracted tarball" time cp -r $FILE "$FILE"2 if [ $? -ne 0 ]; then exit 1 fi time sync echo "Remove copied tarball" time rm -rf "$FILE"2 if [ $? -ne 0 ]; then exit 1 fi time sync if [ `uname` = "Linux" ]; then echo "Testing doctesting of sage_object.pyx" cd $FILE export DOT_SAGE=`pwd`/dot_sage echo "Doctesting entire sage tree using 20 threads." time ./sage -tp 20 devel/sage/sage > /dev/null 2>/dev/null fi;

RESULTS:

## Using a RAMDISK on X4450

RUN 1

[email protected]:/bench$ time ./bench Deleting left around test_tar Extract tarball real 0m4.280s user 0m0.180s sys 0m4.100s real 0m0.087s user 0m0.010s sys 0m0.010s Remove tarball real 0m0.316s user 0m0.000s sys 0m0.320s real 0m0.103s user 0m0.000s sys 0m0.000s Create tarball real 0m4.151s user 0m0.150s sys 0m4.000s real 0m0.041s user 0m0.000s sys 0m0.000s Check size of tarball 1.8G test_tar real 0m0.105s user 0m0.010s sys 0m0.100s real 0m0.044s user 0m0.000s sys 0m0.000s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m0.089s user 0m0.050s sys 0m0.040s real 0m0.021s user 0m0.000s sys 0m0.000s Copy extracted tarball real 0m4.239s user 0m0.100s sys 0m4.140s real 0m0.048s user 0m0.000s sys 0m0.000s Remove copied tarball real 0m0.549s user 0m0.020s sys 0m0.530s real 0m0.032s user 0m0.000s sys 0m0.000s Testing doctesting of sage_object.pyx Doctesting entire sage tree using 20 threads. real 2m53.640s user 37m27.420s sys 9m45.210s real 3m8.389s user 37m27.960s sys 9m58.990s

RUN 2

[email protected]:/bench$ time ./bench Deleting left around test_tar Extract tarball real 0m4.192s user 0m0.230s sys 0m3.960s real 0m0.045s user 0m0.000s sys 0m0.000s Remove tarball real 0m0.306s user 0m0.000s sys 0m0.310s real 0m0.031s user 0m0.000s sys 0m0.000s Create tarball real 0m4.078s user 0m0.140s sys 0m3.940s real 0m0.028s user 0m0.000s sys 0m0.000s Check size of tarball 1.8G test_tar real 0m0.105s user 0m0.030s sys 0m0.070s real 0m0.055s user 0m0.000s sys 0m0.000s Find test ./devel/sage-main/sage/structure/sage_object.pyx ./devel/sage-main/build/sage/structure/sage_object.pyx real 0m0.086s user 0m0.060s sys 0m0.020s real 0m0.046s user 0m0.000s sys 0m0.000s Copy extracted tarball real 0m4.150s user 0m0.160s sys 0m3.990s real 0m0.018s user 0m0.000s sys 0m0.000s Remove copied tarball real 0m0.528s user 0m0.010s sys 0m0.520s real 0m0.051s user 0m0.000s sys 0m0.000s Testing doctesting of sage_object.pyx Doctesting entire sage tree using 20 threads. real 3m22.634s user 37m25.810s sys 9m48.960s real 3m37.004s user 37m26.440s sys 10m2.310s

## Using builtin SAS disk on X4450

RUN 1

[email protected]:/tmp/bench$ time ./bench Extract tarball real 0m8.415s user 0m0.230s sys 0m6.650s real 0m36.919s user 0m0.000s sys 0m1.250s Remove tarball real 0m0.679s user 0m0.000s sys 0m0.680s real 0m2.667s user 0m0.000s sys 0m0.000s Create tarball real 0m5.978s user 0m0.190s sys 0m5.790s real 0m24.290s user 0m0.000s sys 0m0.880s Check size of tarball 1.8G test_tar real 0m0.139s user 0m0.010s sys 0m0.130s real 0m0.428s user 0m0.010s sys 0m0.000s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m0.096s user 0m0.030s sys 0m0.070s real 0m0.018s user 0m0.000s sys 0m0.000s Copy extracted tarball real 0m14.928s user 0m0.150s sys 0m6.160s real 0m26.526s user 0m0.000s sys 0m1.030s Remove copied tarball real 0m1.379s user 0m0.040s sys 0m1.340s real 0m0.740s user 0m0.000s sys 0m0.000s

RUN 2

[email protected]:/tmp/bench$ time ./bench Extract tarball real 0m8.654s user 0m0.300s sys 0m6.240s real 0m39.338s user 0m0.000s sys 0m1.350s Remove tarball real 0m0.662s user 0m0.010s sys 0m0.660s real 0m0.203s user 0m0.000s sys 0m0.000s Create tarball real 0m5.919s user 0m0.210s sys 0m5.710s real 0m24.731s user 0m0.000s sys 0m1.000s Check size of tarball 1.8G test_tar real 0m0.135s user 0m0.010s sys 0m0.120s real 0m0.389s user 0m0.000s sys 0m0.000s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m0.096s user 0m0.040s sys 0m0.060s real 0m0.026s user 0m0.000s sys 0m0.000s Copy extracted tarball real 0m23.445s user 0m0.100s sys 0m6.230s real 0m22.188s user 0m0.000s sys 0m1.060s Remove copied tarball real 0m1.462s user 0m0.040s sys 0m1.350s real 0m0.723s user 0m0.000s sys 0m0.020s

## Using the USB disk on X4450 locally (/wd)

[email protected]:~/tmp/bench$ ./bench Extract tarball real 0m6.651s user 0m0.210s sys 0m6.370s real 1m23.883s user 0m0.000s sys 0m1.550s Remove tarball real 0m0.650s user 0m0.000s sys 0m0.620s real 0m0.234s user 0m0.000s sys 0m0.000s Create tarball real 0m5.837s user 0m0.120s sys 0m5.700s real 1m13.255s user 0m0.000s sys 0m1.140s Check size of tarball 1.8G test_tar real 0m0.136s user 0m0.010s sys 0m0.130s real 0m0.415s user 0m0.000s sys 0m0.000s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m0.099s user 0m0.060s sys 0m0.040s real 0m0.038s user 0m0.000s sys 0m0.000s Copy extracted tarball real 0m6.640s user 0m0.220s sys 0m6.080s real 1m23.672s user 0m0.000s sys 0m1.320s Remove copied tarball real 0m1.360s user 0m0.010s sys 0m1.350s real 0m0.830s user 0m0.000s sys 0m0.010s doctest sage_object.pyx: [email protected]:~/tmp/bench/test_tar$ time ./sage -t devel/sage/sage/structure/sage_object.pyx >/dev/null 2>/dev/null real 0m3.003s user 0m2.350s sys 0m0.560s doctest all sage with -tp 20: real 2m50.116s user 37m8.430s sys 9m50.840s

## Using the USB disk (/wd) served from sage.math over the network via NFS on geom.math

[email protected]:~/tmp/bench$ ./bench Extract tarball real 13m25.195s user 0m0.380s sys 0m15.210s real 0m1.169s user 0m0.000s sys 0m0.000s Remove tarball real 0m1.019s user 0m0.000s sys 0m0.280s real 0m1.221s user 0m0.000s sys 0m0.000s Create tarball real 1m46.367s user 0m0.200s sys 0m7.300s real 0m2.145s user 0m0.000s sys 0m0.000s Check size of tarball 1.9G test_tar real 0m7.033s user 0m0.060s sys 0m1.250s real 0m0.670s user 0m0.000s sys 0m0.010s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m1.260s user 0m0.110s sys 0m0.320s real 0m1.256s user 0m0.000s sys 0m0.020s Copy extracted tarball real 9m43.929s user 0m0.330s sys 0m13.360s real 0m2.293s user 0m0.000s sys 0m0.000s Remove copied tarball real 2m51.147s user 0m0.060s sys 0m2.500s real 0m1.995s user 0m0.000s sys 0m0.000s Testing doctesting of sage_object.pyx [email protected]:~/tmp/bench/test_tar$ sync; time ./sage -tp 20 devel/sage/sage > /dev/null 2>/dev/null real 26m51.001s user 59m12.220s sys 443m32.040s ???

## Using X4540 root filesystem ZFS

[email protected]:~/bench$ ./bench Extract tarball real 1m23.932s user 0m0.891s sys 0m16.022s real 0m5.381s user 0m0.001s sys 0m0.004s Remove tarball real 0m0.049s user 0m0.001s sys 0m0.012s real 0m1.307s user 0m0.001s sys 0m0.004s Create tarball real 1m42.422s user 0m0.870s sys 0m11.583s real 0m4.807s user 0m0.001s sys 0m0.004s Check size of tarball 1.9G tar_test real 0m6.250s user 0m0.097s sys 0m0.586s real 0m1.206s user 0m0.001s sys 0m0.004s Find test ./devel/sage-main/sage/structure/sage_object.pyx ./devel/sage-main/build/sage/structure/sage_object.pyx real 0m6.459s user 0m0.116s sys 0m0.608s real 0m1.187s user 0m0.001s sys 0m0.004s Copy extracted tarball real 1m53.577s user 0m0.594s sys 0m11.629s real 0m6.029s user 0m0.001s sys 0m0.003s Remove copied tarball real 0m8.951s user 0m0.069s sys 0m1.961s real 0m1.829s user 0m0.001s sys 0m0.004s

## Using X4540's original tank pool (the 47 disk raidz1)

[email protected]:/tank/home/wstein/build/b$ ./bench Extract tarball real 9m29.873s user 0m0.990s sys 1m5.320s real 0m1.412s user 0m0.001s sys 0m0.003s Remove tarball real 0m0.198s user 0m0.001s sys 0m0.014s real 0m1.219s user 0m0.001s sys 0m0.004s Create tarball real 5m4.167s user 0m0.960s sys 0m24.742s real 0m1.554s user 0m0.001s sys 0m0.004s Check size of tarball 1.9G tar_test real 0m7.436s user 0m0.085s sys 0m0.607s real 0m1.184s user 0m0.001s sys 0m0.003s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m7.154s user 0m0.094s sys 0m0.610s real 0m1.369s user 0m0.001s sys 0m0.003s Copy extracted tarball real 6m41.956s user 0m0.603s sys 0m22.431s real 0m1.703s user 0m0.001s sys 0m0.003s Remove copied tarball real 0m13.438s user 0m0.086s sys 0m2.427s real 0m1.516s user 0m0.001s sys 0m0.003s

## A new ZFS Raidz2 pool on disk.math

[email protected]:~# zpool create -f tank raidz2 c4t1d0 c4t2d0 c4t3d0 [email protected]:/tank/bench$ ./bench Extract tarball real 0m44.739s user 0m0.748s sys 0m11.993s real 0m5.136s user 0m0.001s sys 0m0.004s Remove tarball rm: remove write-protected regular file `tar_test.tar'? yes real 0m5.731s user 0m0.001s sys 0m0.021s real 0m0.126s user 0m0.001s sys 0m0.004s Create tarball real 1m18.808s user 0m0.641s sys 0m8.777s real 0m2.828s user 0m0.001s sys 0m0.003s Check size of tarball 1.9G tar_test real 0m6.500s user 0m0.058s sys 0m0.412s real 0m0.005s user 0m0.001s sys 0m0.003s Find test ./devel/sage-main/sage/structure/sage_object.pyx ./devel/sage-main/build/sage/structure/sage_object.pyx real 0m6.801s user 0m0.063s sys 0m0.442s real 0m0.005s user 0m0.001s sys 0m0.004s Copy extracted tarball real 1m25.806s user 0m0.609s sys 0m11.100s real 0m5.224s user 0m0.001s sys 0m0.004s Remove copied tarball real 0m10.913s user 0m0.058s sys 0m1.605s real 0m0.462s user 0m0.001s sys 0m0.004s

Do it again but with a spare:

zpool add -f tank spare c4t4d0 ... Remove tarball real 0m0.076s user 0m0.001s sys 0m0.019s real 0m0.123s user 0m0.001s sys 0m0.004s Create tarball real 1m19.117s user 0m0.601s sys 0m8.397s real 0m2.783s user 0m0.001s sys 0m0.003s Check size of tarball 1.9G tar_test real 0m6.651s user 0m0.097s sys 0m0.581s real 0m0.005s user 0m0.001s sys 0m0.004s Find test ./devel/sage-main/sage/structure/sage_object.pyx ./devel/sage-main/build/sage/structure/sage_object.pyx real 0m6.898s user 0m0.112s sys 0m0.623s real 0m0.005s user 0m0.001s sys 0m0.004s Copy extracted tarball real 1m27.787s user 0m0.617s sys 0m11.275s real 0m6.213s user 0m0.001s sys 0m0.004s Remove copied tarball real 0m11.173s user 0m0.085s sys 0m2.242s real 0m0.467s user 0m0.001s sys 0m0.003s

## Double the number of disks and include the spare

[email protected]:~# zpool destroy tank [email protected]:~# zpool create -f tank raidz2 c4t1d0 c4t2d0 c4t3d0 c4t4d0 c4t5d0 c4t6d0 [email protected]:~# zpool add -f tank spare c4t7d0 [email protected]:/tank/bench$ ./bench Extract tarball real 0m22.055s user 0m0.511s sys 0m9.266s real 0m1.945s user 0m0.000s sys 0m0.002s Remove tarball real 0m0.131s user 0m0.001s sys 0m0.015s real 0m0.135s user 0m0.001s sys 0m0.003s Create tarball real 0m39.516s user 0m0.795s sys 0m11.394s real 0m0.793s user 0m0.000s sys 0m0.002s Check size of tarball 1.9G tar_test real 0m5.779s user 0m0.057s sys 0m0.415s real 0m0.003s user 0m0.000s sys 0m0.002s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m5.972s user 0m0.075s sys 0m0.506s real 0m0.003s user 0m0.000s sys 0m0.002s Copy extracted tarball real 0m45.943s user 0m0.359s sys 0m8.232s real 0m1.371s user 0m0.001s sys 0m0.003s Remove copied tarball real 0m10.195s user 0m0.049s sys 0m1.391s real 0m0.465s user 0m0.000s sys 0m0.002s

Same as above, but from an NFS mount on sage.math!

Extract tarball real 27m17.589s user 0m0.650s sys 0m12.800s real 0m0.709s user 0m0.000s sys 0m0.010s Remove tarball real 0m0.370s user 0m0.000s sys 0m0.270s real 0m0.029s user 0m0.000s sys 0m0.000s Create tarball real 0m43.244s user 0m0.300s sys 0m8.180s real 0m0.558s user 0m0.000s sys 0m0.000s Check size of tarball 1.9G tar_test real 0m4.702s user 0m0.050s sys 0m0.980s real 0m0.018s user 0m0.000s sys 0m0.000s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m1.006s user 0m0.040s sys 0m0.320s real 0m0.034s user 0m0.000s sys 0m0.000s Copy extracted tarball real 20m37.314s user 0m0.440s sys 0m14.000s real 0m0.143s user 0m0.000s sys 0m0.000s Remove copied tarball real 6m32.163s user 0m0.120s sys 0m2.990s real 0m0.235s user 0m0.000s sys 0m0.000s

## geom.math mounting via nfs the /wd drive

This mount option: sage:/wd/vmware /bench nfs rsize=32768,wsize=32768,intr,noatime 0 0 [email protected]:/bench/bench$ time ./bench Extract tarball real 12m17.771s user 0m0.540s sys 0m11.950s real 0m0.023s user 0m0.000s sys 0m0.010s Remove tarball real 0m1.021s user 0m0.000s sys 0m0.260s real 0m0.002s user 0m0.000s sys 0m0.000s Create tarball real 1m50.797s user 0m0.310s sys 0m7.150s real 0m0.006s user 0m0.000s sys 0m0.000s Check size of tarball 1.9G test_tar real 0m6.299s user 0m0.060s sys 0m1.060s real 0m0.018s user 0m0.010s sys 0m0.010s Find test ./devel/sage-main/build/sage/structure/sage_object.pyx ./devel/sage-main/sage/structure/sage_object.pyx real 0m1.015s user 0m0.060s sys 0m0.240s real 0m0.019s user 0m0.000s sys 0m0.000s Copy extracted tarball real 9m59.754s user 0m0.380s sys 0m13.390s real 0m0.031s user 0m0.000s sys 0m0.000s Remove copied tarball real 4m19.422s user 0m0.080s sys 0m2.680s real 0m0.054s user 0m0.010s sys 0m0.010s Testing doctesting of sage_object.pyx ./bench: line 59: cd: tar_test: No such file or directory Doctesting sage_object.pyx twice real 0m0.001s user 0m0.000s sys 0m0.000s real 0m0.000s user 0m0.000s sys 0m0.000s Doctesting entire sage tree using 20 threads. real 0m0.000s user 0m0.000s sys 0m0.000s real 28m36.262s user 0m1.460s sys 0m36.760s