Hi,
Is it normally that high cost function call issue about event_queue_remove()?
I profiles my program with gprof. I found the most spent time function call is
event_queue_remove().
However, I only remove events when connection is closed (conn_drop()).
There are two types events with flag EV_WRITE and (EV_READ | EV_PERSIST) in my
program. And, there are about 250 connections and 250*2 events (read and write
fd).
========================================================
[Pseudo Code]
static void conn_drop(struct conn *c)
{
event_del(&c->read_event);
event_del(&c->write_event);
...
}
static void conn_read(int fd, short what, void *d)
{
struct conn *c = (struct conn*) d;
if( read successfully )
{
//do something
if( we need reply in this time )
event_add(&c->write_event, NULL);
}
else conn_drop();
}
static void conn_write(int fd, short what, void *d)
{
struct conn *c = (struct conn*) d;
if( write successfully )
{
//do something
}
else conn_drop(); // never occur in this test
if( write was not completed)
event_add(&c->write_event, NULL); // reschedle
}
void accept_connection()
{
...
struct conn *c = new (struct conn);
event_set(&c->read_event, c->fd, EV_READ | EV_PERSIST, conn_read, c);
event_add(&c->read_event, NULL);
event_set(&c->write_event, c->fd, EV_WRITE, conn_write, c);
}
========================================================
[ result of gprof are listed below]
Each sample counts as 0.01 seconds. (no list all!)
% cumulative self self total
time seconds seconds calls s/call s/call name
8.65 0.34 0.34 85441 0.00 0.00 event_queue_remove (No.1)
5.85 0.57 0.23 GetResource() (No.2)
3.05 1.91 0.12 1225 0.00 0.00 epoll_dispatch
1.40 2.62 0.06 30608 0.00 0.00 conn_write(int, short,
void*)
1.02 2.89 0.04 23800 0.00 0.00 conn_read(int, short,
void*)
0.89 3.04 0.04 85732 0.00 0.00 event_queue_insert
0.64 3.36 0.03 58045 0.00 0.00 event_add
0.25 3.73 0.01 76 0.00 0.00 conn_drop(connection*,
char const*)
0.25 3.76 0.01 1 0.01 2.00 event_base_loop
0.00 3.93 0.00 30771 0.00 0.00 event_del
0.00 3.93 0.00 328 0.00 0.00 server_accept(int, short,
void*)
========================================================
Call graph (explanation follows)
granularity: each sample hit covers 2 byte(s) for 0.25% of 3.93 seconds
index % time self children called name
-----------------------------------------------
0.01 1.99 1/1 event_loop [3]
[4] 50.8 0.01 1.99 1 event_base_loop [4]
0.04 1.37 23800/23800 conn_read(int, short, void*)
[5]
0.12 0.15 1225/1225 epoll_dispatch [14]
0.22 0.00 54756/85441 event_queue_remove [13]
0.06 0.00 30608/30608 conn_write(int, short, void*)
[37]
0.00 0.00 10/30771 event_del [24]
0.00 0.00 10/85732 event_queue_insert [46]
0.00 0.00 1225/2450 evsignal_recalc [160]
0.00 0.00 3675/3687 gettime [170]
0.00 0.00 2450/2450 event_tree_RB_MINMAX [171]
0.00 0.00 1225/1225 epoll_recalc [172]
0.00 0.00 10/10 event_tree_RB_NEXT [177]
0.00 0.00 10/10 event_tree_RB_REMOVE [178]
0.00 0.00 10/54780 event_active [169]
-----------------------------------------------
0.12 0.00 30685/85441 event_del [24]
0.22 0.00 54756/85441 event_base_loop [4]
[13] 8.7 0.34 0.00 85441 event_queue_remove [13]
-----------------------------------------------
0.00 0.00 10/30771 event_base_loop [4]
0.00 0.00 152/30771 conn_drop(connection*, char
const*) [77]
0.00 0.13 30609/30771 epoll_dispatch [14]
[24] 3.4 0.00 0.13 30771 event_del [24]
0.12 0.00 30685/85441 event_queue_remove [13]
0.01 0.00 30685/30685 epoll_del [83]
-----------------------------------------------
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