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| author | https://me.yahoo.com/a/g3Ccalpj0NhN566pHbUl6i9QF0QEkrhlfPM-#b1c14 <diana@web> | 2015-02-16 20:08:03 +0100 |
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| committer | GNU Hurd web pages engine <web-hurd@gnu.org> | 2015-02-16 20:08:03 +0100 |
| commit | 95878586ec7611791f4001a4ee17abf943fae3c1 (patch) | |
| tree | 847cf658ab3c3208a296202194b16a6550b243cf /open_issues/system_crash_pflocal_fifo.mdwn | |
| parent | 8063426bf7848411b0ef3626d57be8cb4826715e (diff) | |
rename open_issues.mdwn to service_solahart_jakarta_selatan__082122541663.mdwn
Diffstat (limited to 'open_issues/system_crash_pflocal_fifo.mdwn')
| -rw-r--r-- | open_issues/system_crash_pflocal_fifo.mdwn | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/open_issues/system_crash_pflocal_fifo.mdwn b/open_issues/system_crash_pflocal_fifo.mdwn deleted file mode 100644 index 1dddc44e..00000000 --- a/open_issues/system_crash_pflocal_fifo.mdwn +++ /dev/null @@ -1,41 +0,0 @@ -[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]] - -[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable -id="license" text="Permission is granted to copy, distribute and/or modify this -document under the terms of the GNU Free Documentation License, Version 1.2 or -any later version published by the Free Software Foundation; with no Invariant -Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license -is included in the section entitled [[GNU Free Documentation -License|/fdl]]."]]"""]] - -[[!tag open_issue_gnumach]] - -IRC, unknown channel, unknown date: - -`cat < /dev/zero | cat > /dev/null` will eventually make the system crash, -likewise when using a FIFO. - - <antrik> hm... VM activity seems much higher when running fifo than pfinet... may be the cause - <antrik> "zero filled" and "page faults" are serveral times higher with pipe than with pfinet - <antrik> (cow faults however are about the same...) - <antrik> pflocal is about the same as fifo - - <antrik> no, because it usually takes like 20 minutes until it crashes, sometimes much longer - - <antrik> not sure, but the longest so far was in the range of hours IIRC - - <antrik> I think I never tested what happens on "cat /dev/zero >/dev/null"... another thing yet to try - - <antrik> Linux BTW seems to employ some major VM trickery in this case -- dd shows a transfer rate of 10 GB/s... - - <antrik> no, no anomalies in vmstat - <antrik> the only observation I made is that number of page faults and some other number rise pretty quickly with pflocal and fifo, but not with pfinet - <antrik> I guess that's somehow related to the fact that pfinet doesn't crash -- though I guess the difference is simply that pfinet is way slower... - <antrik> (haven't checked that, though) - - <antrik> BTW, I'm not sure you got it right: the test case is "cat /dev/zero|cat >/dev/null", *not* "cat /dev/zero >/dev/null" - - <antrik> OK, "cat /dev/zero|tail -c 1" also crashes, so it's definitely not related to /dev/null - <antrik> "dd if=/dev/zero|tail -c 1" crashes as well - <antrik> but "tail -c 1 /dev/zero" doesn't seem to - <antrik> cool... running multiple instances of the pipe test also considerably speeds up the crash |