Florian Weimer <fweimer@xxxxxxxxxx> writes:
> * Omair Majid:
>
>> Florian Weimer <fweimer@xxxxxxxxxx> writes:
>>
>>> * Jan Kratochvil:
>>>
>>>> gold is also limited by 'ulimit -S -n', I had to raise it while building LLDB
>>>> (using -DLLVM_USE_LINKER=gold).
>>>
>>> gold should either do this upon start (like OpenJDK does),
>>
>> Do you have any pointers to source or docs that explain the OpenJDK
>> technique for this?
>
> Uhm, now I have to look. I hope it really does that, I noticed it only
> because it was possible to open more than 1024 files, contrary to what I
> expected based on the system configuration.
>
> The responsible code is os::init_2(), in
> src/hotspot/os/linux/os_linux.cpp:
>
> if (MaxFDLimit) {
> // set the number of file descriptors to max. print out error
> // if getrlimit/setrlimit fails but continue regardless.
> struct rlimit nbr_files;
> int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
> if (status != 0) {
> log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
> } else {
> nbr_files.rlim_cur = nbr_files.rlim_max;
> status = setrlimit(RLIMIT_NOFILE, &nbr_files);
> if (status != 0) {
> log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
> }
> }
> }
>
> rlim_max is what is sometimes called the hard limit, rlim_cur the soft
> limit. It is the difference between “ulimit -S -n” and “ulimit -H -n”.
> The quoted code fragment raises the soft limit up to the hard limit,
> which is as far as you can go without additional privileges.
>
> Does this answer your question?
Yes, it does. Thanks.
(I was secretly hoping there was a way to bump rlim_cur past
the current value of rlim_max...)
Omair
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