[rrd-developers] Re: RRDs.xs malloc to multi-dimensional array

[Alexandre CHERIF]

On Tue, 13 Aug 2002 22:51:16 +0200 (MEST)
Tobias Oetiker <oetiker at ee.ethz.ch> wrote:


> 
> Alexandre, ds_cnt is normally 2 or 3 or 20 in any event this will
> no have a major impact I guess
> tobi
> >

i was too fast in finding the wrong part of code...sorry for the miss leading. my first mail was right
the perl shared module got memory allocation problem as far as i see.

here is the clue
truss -c rrdtool fetch /file.rrd "AVERAGE" "-s -1y" > /dev/null
syscall              seconds   calls  errors
_exit                    .00       1
read                     .03     208
write                    .00     328
open                     .00       8      1
close                    .00       7
time                     .00       3
brk                      .00       8
lseek                    .00       2
sysi86                   .00       1
ioctl                    .00       2      2
execve                   .00       1
mmap                     .00      11
munmap                   .00       2
fxstat                   .00       4
memcntl                  .00       2
sysconfig                .00       1
llseek                   .00       4
resolvepath              .00       1
fstat64                  .00       2
                     -------  ------   ----
sys totals:              .03     596      3
usr time:                .53
elapsed:                 .59

and then with the perl module
syscall              seconds   calls  errors
_exit                    .00       1
read                     .03     229
open                     .00      21      8
close                    .00      24
time                     .00       4
brk                      .12    2750
lseek                    .00       2
getpid                   .00       1
getuid                   .00       2
getgid                   .00       2
sysi86                   .00       1
ioctl                    .00      12     12
execve                   .00       1
fcntl                    .00       1
sigaction                .00       1
getcontext               .00      25
setcontext               .00       1
mmap                     .00      33
mprotect                 .00       4
munmap                   .00       9
fxstat                   .00      10
memcntl                  .00       8
sysconfig                .00       2
llseek                   .00      15
resolvepath              .00       1
stat64                   .00      24     21
fstat64                  .00      12
open64                   .00      20      9
                     -------  ------   ----
sys totals:              .15    3216     50
usr time:                .48
elapsed:                 .90

as you can see brk has been get called 2750 times, and the total time of fetching the data has a factor of two, most
of the time, the system allocate memory. 




-- 
Alexandre
==
Don't try and use this release for anything useful. We have made every effort to ensure that all
bits in this package are either 0 or 1. However, these bits may not be in the correct order and proportion. 
==

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