I'm running an application containing a mmap(with MAP_POPULATE) the large file.
However, the SIGPROF handler (i.e., _samplesready) was never invoked while executing mmap.
As far as I debugged, it doesn't seem like a signal pending, it just looks like 'ignored' (-> I believe it's not a well-defined term).
I know the mmap system call with MAP_POPULATE that memory-maps large file causes many I/Os, however, I thought that COZ could sample the period of executing CPU code (e.g., mmap in application, mmap in glibc, mmap in Linux kernel).
When I added simple computation code after the mmap(), the SIGPROF handler started to execute during the computation part.
Does COZ can conduct the virtual speedup application with mmap()?
Hi.
I'm running an application containing a mmap(with MAP_POPULATE) the large file.
However, the SIGPROF handler (i.e., _samplesready) was never invoked while executing mmap.
As far as I debugged, it doesn't seem like a signal pending, it just looks like 'ignored' (-> I believe it's not a well-defined term).
I know the mmap system call with MAP_POPULATE that memory-maps large file causes many I/Os, however, I thought that COZ could sample the period of executing CPU code (e.g., mmap in application, mmap in glibc, mmap in Linux kernel).
When I added simple computation code after the mmap(), the SIGPROF handler started to execute during the computation part.
Does COZ can conduct the virtual speedup application with mmap()?
Any experience? I need your advise:) Thanks.