ValueError: current limit exceeds maximum limit

[xiandong79]

• Flintrock version: 0.9.0
• Python version: 3.6.3
• OS: MAC

1. flintrock --version
   Traceback (most recent call last):
   File "/usr/local/bin/flintrock", line 11, in <module>
   sys.exit(main())
   File "/usr/local/lib/python3.6/site-packages/flintrock/flintrock.py", line 1125, in main
   set_open_files_limit(4096)
   File "/usr/local/lib/python3.6/site-packages/flintrock/flintrock.py", line 1105, in set_open_files_limit
   (min(desired_limit, hard_limit), hard_limit))
   ValueError: current limit exceeds maximum limit

I have to use sudo to fix the problem.

[nchammas]

Hmm, you should not need sudo. What version of macOS are you running and what does ulimit -aH return?

[xiandong79]

1. macOS Sierra version 10.12.6

2. ➜  ~ ulimit -aH
   -t: cpu time (seconds)              unlimited
   -f: file size (blocks)              unlimited
   -d: data seg size (kbytes)          unlimited
   -s: stack size (kbytes)             65532
   -c: core file size (blocks)         unlimited
   -v: address space (kbytes)          unlimited
   -l: locked-in-memory size (kbytes)  unlimited
   -u: processes                       1064
   -n: file descriptors                10240

[nchammas]

That's strange. Your hard limit for file descriptors is 10240, and Flintrock is requesting less than that (4096) so it should work.

When you get that error, what does ulimit -n show?

[xiandong79]

~ ulimit -n
1024

By the way, the launching speed is amazing !!! You really did something!

[nchammas]

Thank you. 😄

What do you get if you run ulimit -n 4096 followed by ulimit -n?

[xiandong79]

~  ulimit -n
1024
  ~  ulimit -n 4096
ulimit: setrlimit failed: invalid argument

[xiandong79]

~ ulimit -n 8192
➜  ~ ulimit -a
-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8192
-c: core file size (blocks)         0
-v: address space (kbytes)          unlimited
-l: locked-in-memory size (kbytes)  unlimited
-u: processes                       709
-n: file descriptors                8192
➜  ~ ulimit -n
8192

[xiandong79]

It works well now!

[nchammas]

I'm confused how the second attempt worked (8192) but the first didn't (4096).

You may have to adjust some kernel limits to let Flintrock modify the file descriptor limit without sudo. This discussion should help guide you.

[nchammas]

Glad to hear it works now!