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Remove potential starvation of a full log buffer flush: only flush up to the lsn which was the largest at the time when we requested the full log buffer flush
os0sync.h, os0sync.c:
  Fix a bug in os_event on Unix: even though we signaled the event, some threads could continue waiting if the event became nonsignaled quickly again; this made group commit less efficient than it should be
This commit is contained in:
heikki@hundin.mysql.fi
2003-07-03 21:25:55 +03:00
parent 3f4f339f15
commit 2a1f87ff72
9 changed files with 97 additions and 22 deletions
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20
innobase/srv/srv0srv.c
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@ -2836,7 +2836,7 @@ loop:
at transaction commit */
srv_main_thread_op_info = (char*)"flushing log";
log_write_up_to(ut_dulint_max, LOG_WAIT_ONE_GROUP, TRUE);
log_buffer_flush_to_disk();
/* If there were less than 5 i/os during the
one second sleep, we assume that there is free
@ -2852,10 +2852,9 @@ loop:
(char*)"doing insert buffer merge";
ibuf_contract_for_n_pages(TRUE, 5);
srv_main_thread_op_info =
(char*)"flushing log";
log_write_up_to(ut_dulint_max, LOG_WAIT_ONE_GROUP,
TRUE);
srv_main_thread_op_info = (char*)"flushing log";
log_buffer_flush_to_disk();
}
if (buf_get_modified_ratio_pct() >
@ -2905,7 +2904,7 @@ loop:
buf_flush_batch(BUF_FLUSH_LIST, 100, ut_dulint_max);
srv_main_thread_op_info = (char*) "flushing log";
log_write_up_to(ut_dulint_max, LOG_WAIT_ONE_GROUP, TRUE);
log_buffer_flush_to_disk();
}
/* We run a batch of insert buffer merge every 10 seconds,
@ -2915,7 +2914,7 @@ loop:
ibuf_contract_for_n_pages(TRUE, 5);
srv_main_thread_op_info = (char*)"flushing log";
log_write_up_to(ut_dulint_max, LOG_WAIT_ONE_GROUP, TRUE);
log_buffer_flush_to_disk();
/* We run a full purge every 10 seconds, even if the server
were active */
@ -2939,8 +2938,7 @@ loop:
if (difftime(current_time, last_flush_time) > 1) {
srv_main_thread_op_info = (char*) "flushing log";
log_write_up_to(ut_dulint_max, LOG_WAIT_ONE_GROUP,
TRUE);
log_buffer_flush_to_disk();
last_flush_time = current_time;
}
}
@ -3060,6 +3058,10 @@ flush_loop:
(char*) "waiting for buffer pool flush to end";
buf_flush_wait_batch_end(BUF_FLUSH_LIST);
srv_main_thread_op_info = (char*) "flushing log";
log_buffer_flush_to_disk();
srv_main_thread_op_info = (char*)"making checkpoint";
log_checkpoint(TRUE, FALSE);