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Add an environment variable for controlling the default Thread quantum

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This commit adds an environment variable `RUBY_THREAD_TIMESLICE` for
specifying the default thread quantum in milliseconds.  You can adjust
this variable to tune throughput, which is especially useful on
multithreaded systems that are mixing CPU bound work and IO bound work.

The default quantum remains 100ms.

[Feature #20861]

Co-Authored-By: John Hawthorn <john@hawthorn.email>
This commit is contained in:
Aaron Patterson 2024-11-01 15:06:35 -07:00 • committed by Aaron Patterson
parent e7ee7d43f3
commit fffef9aa5d
Notes: git 2024-12-13 00:05:07 +00:00
4 changed files with 13 additions and 12 deletions
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7
thread_pthread.c
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@ -317,13 +317,6 @@ static void threadptr_trap_interrupt(rb_thread_t *);
#define native_thread_yield() ((void)0)
#endif
/* 100ms. 10ms is too small for user level thread scheduling
* on recent Linux (tested on 2.6.35)
*/
#define TIME_QUANTUM_MSEC (100)
#define TIME_QUANTUM_USEC (TIME_QUANTUM_MSEC * 1000)
#define TIME_QUANTUM_NSEC (TIME_QUANTUM_USEC * 1000)
static void native_thread_dedicated_inc(rb_vm_t *vm, rb_ractor_t *cr, struct rb_native_thread *nt);
static void native_thread_dedicated_dec(rb_vm_t *vm, rb_ractor_t *cr, struct rb_native_thread *nt);
static void native_thread_assign(struct rb_native_thread *nt, rb_thread_t *th);