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Re: Use more threads.

by hv (Parson)
on Feb 27, 2006 at 11:27 UTC ( #532991=note: print w/replies, xml ) Need Help??


in reply to Use more threads.

[renodino] has been unable to find a binary edit utility for the Linux platform.

For setting stacksize, you need the API function setrlimit(2); the manpage refers you also to the bash builtin 'ulimit' and quotactl(1).

Trying that locally against an example from What perl operations will consume C stack space?:

zen% ulimit -s 8192 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 10080 Segmentation fault (core dumped) zen% ulimit -s 32768 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 10080 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 32766 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 32767 Complex regular subexpression recursion limit (32766) exceeded at -e l +ine 1. zen%
.. which gets me to the builtin limit.

Note that the limit may be capped by root, and that more complex systems may use the quota-based accounting method; but any barriers are there to stop people increasing stack size, so they shouldn't cause a problem for your requirements here.

HTH,

Hugo

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[marinersk]: choroba++
[choroba]: it's a long running test, so it's normally skipped unless an env var is set
[choroba]: nobody has been bothered to set the variable in the last 3 years
[marinersk]: sub newtest{my $expected_result = &target('foo'); my $actual_result = &target('foo'); if ($actual_result eq $expected_result) { &tdd_success(); } else { &tdd_fail(); } } # Test works after three years!
[choroba]: or nobody bothered...
[choroba]: The problem was bigger, as the test tried to call a method that didn't exist anymore
[marinersk]: :: ducking ::
[choroba]: because, someone renamed the method, but didn't notice it was used in the test, as the test was skipped
[marinersk]: Well, if the method doesn't exist, it would be hard to pass the test.
[choroba]: later, someone removed the new method, as all its usage places were safe, but didn't notice the test still used the old name

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