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[[!meta copyright="Copyright © 2009, 2011 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_porting]]
Neither the `time` executable from the GNU time package work completely
correctly, nor does the GNU Bash built-in one.
tschwinge@flubber:~ $ \time sleep 2
0.00user 0.00system 9:38:00elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps
tschwinge@flubber:~ $ \time sleep 4
0.00user 0.00system 18:50:25elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps
tschwinge@flubber:~ $ \time sleep 6
0.00user 0.00system 28:00:53elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps
tschwinge@flubber:~ $ time sleep 2
real 0m2.093s
user 0m0.000s
sys 0m0.011s
tschwinge@flubber:~ $ time sleep 4
real 0m4.083s
user 0m0.000s
sys 0m0.010s
tschwinge@flubber:~ $ time sleep 6
real 0m6.164s
user 0m0.000s
sys 0m0.010s
GNU time's *elapsed* value is off by some factor.
$ \time factor 1111111111111111111
1111111111111111111: 1111111111111111111
0.00user 0.00system 52:39:24elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps
$ time factor 1111111111111111111
1111111111111111111: 1111111111111111111
real 0m11.424s
user 0m0.000s
sys 0m0.010s
As above; also here all the running time should be attriuted to *user* time.
This is probably a [[!taglink open_issue_gnumach]].
# 2011-09-02
Might want to revisit this, and take Xen [[!tag open_issue_xen]] into account
-- I believe flubber has already been Xenified at that time.
## IRC, freenode, #hurd, 2011-09-02
While testing some [[performance/IPC_virtual_copy]] performance issues:
<tschwinge> And I can confirm that with dd if=/dev/zero of=/dev/null bs=4k
running, a parallel sleep 10 takes about 20 s (on strauss).
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