0000333: MR_num_idle_engines count goes wrong

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Category

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Date Submitted

Last Update

0000333

mercury

Bug

public

2014-06-16 11:41

2018-03-13 14:38

Reporter

wangp

Assigned To

pbone

Priority

normal

Severity

minor

Reproducibility

always

Status

acknowledged

Resolution

open

Product Version

Target Version

Fixed in Version

Summary

0000333: MR_num_idle_engines count goes wrong

Description

Hi Paul, I think you can solve this faster than I can.

I've made a copy of the parallel fib benchmark, except that it repeats. Parallel execution works for the first fib call. Afterwards, fewer engines do any work. Soon, parallel execution never occurs again.

MR_num_idle_engines should be the culprit:

Program received signal SIGINT, Interrupt.
0x0000000000405dac in fib_par_plain_module1 () at fib_par_plain.c:206
206 MR_parent_sv(3) = MR_r1;
(gdb) p MR_num_idle_engines
$2 = -2
(gdb) c
Continuing.
fib(40) = 165580141
fib(40) = 165580141
^C
Program received signal SIGINT, Interrupt.
0x00007ffff6789d00 in sem_wait () from /lib64/libpthread.so.0
(gdb) p MR_num_idle_engines
$3 = 0

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No tags attached.

Attached Files

fib_par_plain.m (435 bytes) 2014-06-16 11:41

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Notes
~0000700 pbone (administrator) 2014-06-16 12:14	It looks very odd where MR_num_idle_engines is -2. I'll take a look but I think 0000334 should be done first and might even help with this bug. Thanks.

~0000982 pbone (administrator) 2018-03-13 14:38	Unassigned things from me.

Notes

Date Modified	Username	Field	Change
Issue History
2014-06-16 11:41	wangp	New Issue
2014-06-16 11:41	wangp	Status	new => assigned
2014-06-16 11:41	wangp	Assigned To	=> pbone
2014-06-16 11:41	wangp	File Added: fib_par_plain.m
2014-06-16 12:14	pbone	Note Added: 0000700
2018-03-13 14:38	pbone	Status	assigned => acknowledged
2018-03-13 14:38	pbone	Note Added: 0000982

Issue History