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Bug# 20352. Added variable srv_insert_buffer_batch_size. We want to make

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this variable settable. Since the pluggable engine interface currently
doesn't provide a usable mechanism, we will add the latter functionality
once it's available.
This commit is contained in:
sunny 2007-04-11 04:12:40 +00:00
parent 9479a35490
commit f30895bdfc
1 changed files with 15 additions and 3 deletions
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18
srv/srv0srv.c
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@ -180,6 +180,16 @@ dulint srv_archive_recovery_limit_lsn;
ulint srv_lock_wait_timeout = 1024 * 1024 * 1024; ulint srv_lock_wait_timeout = 1024 * 1024 * 1024;
/* This parameter is used to throttle the number of insert buffers that are
merged in a batch. By increasing this parameter on a faster disk you can
possibly reduce the number of I/O operations performed to complete the
merge operation. The value of this parameter is used as is by the
background loop when the system is idle (low load), on a busy system
the parameter is scaled down by a factor of 4, this is to avoid putting
a heavier load on the I/O sub system. */
ulong srv_insert_buffer_batch_size = 20;
char* srv_file_flush_method_str = NULL; char* srv_file_flush_method_str = NULL;
ulint srv_unix_file_flush_method = SRV_UNIX_FDATASYNC; ulint srv_unix_file_flush_method = SRV_UNIX_FDATASYNC;
ulint srv_win_file_flush_method = SRV_WIN_IO_UNBUFFERED; ulint srv_win_file_flush_method = SRV_WIN_IO_UNBUFFERED;
@ -2270,7 +2280,8 @@ loop:
+ buf_pool->n_pages_written; + buf_pool->n_pages_written;
if (n_pend_ios < 3 && (n_ios - n_ios_old < 5)) { if (n_pend_ios < 3 && (n_ios - n_ios_old < 5)) {
srv_main_thread_op_info = "doing insert buffer merge"; srv_main_thread_op_info = "doing insert buffer merge";
ibuf_contract_for_n_pages(TRUE, 5); ibuf_contract_for_n_pages(TRUE,
srv_insert_buffer_batch_size / 4);
srv_main_thread_op_info = "flushing log"; srv_main_thread_op_info = "flushing log";
@ -2331,7 +2342,7 @@ loop:
even if the server were active */ even if the server were active */
srv_main_thread_op_info = "doing insert buffer merge"; srv_main_thread_op_info = "doing insert buffer merge";
ibuf_contract_for_n_pages(TRUE, 5); ibuf_contract_for_n_pages(TRUE, srv_insert_buffer_batch_size / 4);
srv_main_thread_op_info = "flushing log"; srv_main_thread_op_info = "flushing log";
log_buffer_flush_to_disk(); log_buffer_flush_to_disk();
@ -2469,7 +2480,8 @@ background_loop:
if (srv_fast_shutdown && srv_shutdown_state > 0) { if (srv_fast_shutdown && srv_shutdown_state > 0) {
n_bytes_merged = 0; n_bytes_merged = 0;
} else { } else {
n_bytes_merged = ibuf_contract_for_n_pages(TRUE, 20); n_bytes_merged = ibuf_contract_for_n_pages(TRUE,
srv_insert_buffer_batch_size);
} }
srv_main_thread_op_info = "reserving kernel mutex"; srv_main_thread_op_info = "reserving kernel mutex";