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Groups > linux.debian.user > #193234
| From | Schrey <debian-user@schreyben.de> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Some tasks very slow after upgrade from Jessie to Stretch |
| Date | 2018-02-28 19:20 +0100 |
| Message-ID | <voeuB-6FJ-1@gated-at.bofh.it> (permalink) |
| Organization | null |
Greetings. Recently I cloned & upgraded a (virtual) build system, from Jessie to Stretch, and some tasks have become so slow that it hurts. Look at 'git archive' for example, the tar part: bob@build-stretch:/stuff/git/linux-stable$ time git archive v3.18.95 | perf stat tar xC /usr/src/test Performance counter stats for 'tar xC /usr/src/test': 125849.626176 task-clock (msec) # 0.945 CPUs utilized 984 context-switches # 0.008 K/sec 3 cpu-migrations # 0.000 K/sec 135 page-faults # 0.001 K/sec 474,044,657,252 cycles # 3.767 GHz 190,146,876,098 stalled-cycles-frontend # 40.11% frontend cycles idle 122,803,944,538 stalled-cycles-backend # 25.91% backend cycles idle 511,500,080,424 instructions # 1.08 insn per cycle # 0.37 stalled cycles per insn 93,671,911,207 branches # 744.316 M/sec 2,810,364,901 branch-misses # 3.00% of all branches 133.182776679 seconds time elapsed real 2m13.234s user 0m4.268s sys 2m6.748s bob@build-jessie:/stuff/git/linux-stable$ time git archive v3.18.95 | perf stat tar xC /usr/src/test Performance counter stats for 'tar xC /usr/src/test': 3908.736041 task-clock (msec) # 0.183 CPUs utilized 44,396 context-switches # 0.011 M/sec 134 cpu-migrations # 0.034 K/sec 133 page-faults # 0.034 K/sec 9,065,881,286 cycles # 2.319 GHz 7,497,944,714 stalled-cycles-frontend # 82.71% frontend cycles idle 6,277,695,339 stalled-cycles-backend # 69.25% backend cycles idle 2,987,957,839 instructions # 0.33 insns per cycle # 2.51 stalled cycles per insn 576,836,524 branches # 147.576 M/sec 14,885,342 branch-misses # 2.58% of all branches 21.365168109 seconds time elapsed real 0m21.426s user 0m4.664s sys 0m6.164s A bit slower now, on Stretch. (and why are the perf numbers vastly different I wonder?) Same thing for 'rm -rf'ing a kernel build tree, on the Stretch VM it's multiple times slower - takes approx. two minutes. KVM, same host, storage is virtio block device in LVM. Setup has been working flawless for years. Host is also Debian. Still Wheezy, but for a reason. I've already - tried different kernels on host and guest - switched to ext3 from ext4 on guest (a bit faster, but not much) - used a local git repo in guest (vs. network share which is default) - asked the Googol but no remedies yet. What am I missing? Has anyone experienced similar things after upgrading from Jessie to Stretch? Regards Ingmar -- assembled from 100% recycled electrons
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Some tasks very slow after upgrade from Jessie to Stretch Schrey <debian-user@schreyben.de> - 2018-02-28 19:20 +0100
Re: Some tasks very slow after upgrade from Jessie to Stretch Don Armstrong <don@debian.org> - 2018-02-28 20:10 +0100
Re: Some tasks very slow after upgrade from Jessie to Stretch David Christensen <dpchrist@holgerdanske.com> - 2018-03-01 05:50 +0100
Re: Some tasks very slow after upgrade from Jessie to Stretch deloptes <deloptes@gmail.com> - 2018-03-01 08:10 +0100
Re: Some tasks very slow after upgrade from Jessie to Stretch Curt <curty@free.fr> - 2018-03-01 11:30 +0100
Re: Some tasks very slow after upgrade from Jessie to Stretch Sven Hartge <sven@svenhartge.de> - 2018-03-01 13:10 +0100
Re: Some tasks very slow after upgrade from Jessie to Stretch rhkramer@gmail.com - 2018-03-01 14:40 +0100
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