PS call utimes(struct tms *) to actual times, plus granularity is CLK_TCK, usually way better than time().
gettimeofday can be used to get wall time even more accurately as well. utimes() returns clock_t wall time.
Jim, utimes() doesn't do what you think it does. Gettimeofday is more correct, but then the code is a bit more complicated. Microsecond differences would not produce the disparities in performance he is seeing.
Jim,
I never tried profiling before, so I ran into some problem here:
$ gcc -pg -o tstloop tstloop.c
$ tstloop
128205.13 semop/s [0,0]
$ gprof tstloop
gprof: gmon.out file is missing call-graph data
That's strange. Any chance you're running a different program that's elsewhere in the path? Try for instance running "./tstloop".
Also, for gprof, use the -l option (small L). I get:
Line 21 is the semctl() function. Line 18 is the semget() call.
Now that we have concrete results, I'd cross-post this on the Linuxquestions.org com site.
The next step would be to use the debug/profiling version of libc (which I don't have floating around) and see if we can use gprof to find the bottleneck therein. Or, look at the source. It would seem to be of great benefit to have this improved.
We can marginally rule out page-faults and the like by looking at the output from /usr/bin/time -v. The minor page fault means the OS reserved a page of memory, and that internal tables were modified, but the process wasn't suspended due to IO or anything like that. It turns out, all of these are due to either the profiling code or the program invocation.
$ gprof -p ./tstloop
Flat profile: Each sample counts as 0.01 seconds.
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
99.70 3.64 3.64 main
I was asked to add this piece of code to a c program which I will execute through the shell:
for(long i = 0; i < NITER; i++)
{ sem_wait( &sema);
count++;
sem_post( &sema); }
I didn't get it, which is the critical section ? if it's "count++" how would a thread wake up in order to enter it... (1 Reply)
If I create a semaphore and then I fork a number of child processes then all the child process use that same semaphore.
Since the process address spaces are different rfom each other then how all the child process are able to access the same semaphore?
I understand that semaphore/mutex is at os... (0 Replies)
Control two exclusively shared resources(semaphore). The two resources are two files. The producer will write even numbers to one file, and odd numbers to another one. The consumer respectively reads from each file until it gets 5 even numbers and 5 odd numbers.
Can any one help me with the... (0 Replies)
I analysed disk performance with blktrace and get some data:
read:
8,3 4 2141 2.882115217 3342 Q R 195732187 + 32
8,3 4 2142 2.882116411 3342 G R 195732187 + 32
8,3 4 2144 2.882117647 3342 I R 195732187 + 32
8,3 4 2145 ... (1 Reply)
Hi,
I am looking to use a semaphore for the first time in one of my scripts. I am just wondering if there are any simple examples or tutorials around?
I am a beginner so the simpler the better :)
Thanks
-Jaken (2 Replies)
Hello,
I have a Supermicro server with a P4SCI mother board running Debian Sarge 3.1. This is the "dmidecode" output related to RAM info:
RAM speed information is incomplete.. "Current Speed: Unknown", is there anyway/soft to get the speed of installed RAM modules? thanks!!
Regards :)... (0 Replies)