Hi, I wrote a post about how to build and test zlib also for distros currently not supported:
http://linux-on-z.blogspot.com/2019/10/howto-exploiting-hardware-compression.html You will find a quick one-liner test at the end of the post which can be used to verify whether hardware compression works in your installation. Andreas On 10.06.20 01:36, Michael MacIsaac wrote: > Hello list, > > I heard about the new DFLTCC instruction on the z15, aka on board > compression. I tried a quick experiment to see the difference from a z14. > Disclaimer: I am not a performance expert.> > Here are three commands to create, compress and decompress a 1G file on a > z14: > > # grep Type: /proc/sysinfo > Type: 3906 > > # time dd if=/dev/zero of=1G.file bs=1G count=1 > 1+0 records in > 1+0 records out > 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 21.93 s, 49.0 MB/s > > real 0m22.047s > user 0m0.001s > sys 0m3.669s > > # time cat 1G.file | gzip -c > 1G.compressed.file > > real 0m7.603s > user 0m5.362s > sys 0m0.789s > > # time cat 1G.compressed.file | gzip -d > 1G.file > > real 0m24.833s > user 0m4.103s > sys 0m1.845s > > Here's the same commands on z15: > > # grep Type: /proc/sysinfo > Type: 8561 > > # time dd if=/dev/zero of=1G.file bs=1G count=1 > 1+0 records in > 1+0 records out > 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 1.59126 s, 675 MB/s > > real 0m1.621s > user 0m0.000s > sys 0m1.216s > > # time cat 1G.file | gzip -c > 1G.compressed.file > > real 0m5.722s > user 0m4.946s > sys 0m0.510s > # time cat 1G.compressed.file | gzip -d > 1G.file > > real 0m6.150s > user 0m3.922s > sys 0m1.290s > > Wow more than 10x faster on dd - was not expecting that as I didn't think > it uses compression. But the compress with gzip -c, was only 25% faster on > the z15 while the decompress was about 4x. > > Are these results expected? > > Thanks. > > > -- > -Mike MacIsaac > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit > http://www2.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390
