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| author | Koichi Sasada <[email protected]> | 2023-04-10 10:53:13 +0900 |
|---|---|---|
| committer | Koichi Sasada <[email protected]> | 2023-10-12 14:47:01 +0900 |
| commit | be1bbd5b7d40ad863ab35097765d3754726bbd54 () | |
| tree | 2995a0859bea1d6b2903dcd324f41869dbef14a1 /debug.c | |
| parent | 096ee0648e215915a3019c2cd68ba220d94eca12 (diff) | |
M:N thread scheduler for Ractors
This introduce M:N thread scheduler for Ractor system. In general, M:N thread scheduler employs N native threads (OS threads) to manage M user-level threads (Ruby threads in this case). On the Ruby interpreter, 1 native thread is provided for 1 Ractor and all Ruby threads are managed by the native thread. From Ruby 1.9, the interpreter uses 1:1 thread scheduler which means 1 Ruby thread has 1 native thread. M:N scheduler change this strategy. Because of compatibility issue (and stableness issue of the implementation) main Ractor doesn't use M:N scheduler on default. On the other words, threads on the main Ractor will be managed with 1:1 thread scheduler. There are additional settings by environment variables: `RUBY_MN_THREADS=1` enables M:N thread scheduler on the main ractor. Note that non-main ractors use the M:N scheduler without this configuration. With this configuration, single ractor applications run threads on M:1 thread scheduler (green threads, user-level threads). `RUBY_MAX_CPU=n` specifies maximum number of native threads for M:N scheduler (default: 8). This will be reverted soon if non-easy issues are found. [Bug #19842]
| -rw-r--r-- | debug.c | 9 |
1 files changed, 7 insertions, 2 deletions
@@ -443,6 +443,10 @@ setup_debug_log(void) (ruby_debug_log_mode & ruby_debug_log_memory) ? "[mem]" : "", (ruby_debug_log_mode & ruby_debug_log_stderr) ? "[stderr]" : "", (ruby_debug_log_mode & ruby_debug_log_file) ? "[file]" : ""); rb_nativethread_lock_initialize(&debug_log.lock); setup_debug_log_filter(); @@ -609,10 +613,11 @@ ruby_debug_log(const char *file, int line, const char *func_name, const char *fm // ractor information if (ruby_single_main_ractor == NULL) { rb_ractor_t *cr = th ? th->ractor : NULL; if (r && len < MAX_DEBUG_LOG_MESSAGE_LEN) { - r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\tr:#%d/%u", - cr ? (int)rb_ractor_id(cr) : -1, GET_VM()->ractor.cnt); if (r < 0) rb_bug("ruby_debug_log returns %d", r); len += r; |