Emysql:ping VS without Ping

Emysql The database is ping once every time the SQL is executed, it's strange! I don't know why.

Here's a rough look at the efficiency test:

The table is as follows:

Mysql> Show CREATE TABLE just_test\g;
1. Row ***************************
Table:just_test
Create table:create Table ' just_test ' (
' ID ' bigint (unsigned) is not NULL,
' Data ' int (one) is not NULL,
' Update_time ' timestamp not NULL DEFAULT current_timestamp on update current_t
Imestamp,
PRIMARY KEY (' id ')
) Engine=innodb DEFAULT Charset=utf8 Collate=utf8_bin
1 row in Set (0.02 sec)

Under the 64-bit Win7 system (Cpu:intel (R) Core (TM) i3 CPU [email protected] 2.93GHz, Memory: 8G),

Create the table, insert a record, and then repeat update the table's data field is a value (SQL such as: Update just_test Set data = 456),

Results:

========with Ping (Ping once before each update) test results: ========

Fg_sql_inf:prof (100).
Loops, using TIME:63MS
Ok
2> fg_sql_inf:prof (100).
Loops, using Time:94ms
Ok
3> fg_sql_inf:prof (100).
Loops, using time:125ms
Ok
4> fg_sql_inf:prof (100).
Loops, using time:78ms
Ok
5> Fg_sql_inf:prof (10000).
10000 loops, using time:4010ms
Ok
6> Fg_sql_inf:prof (10000).
10000 loops, using time:3978ms
Ok
7> Fg_sql_inf:prof (10000).
10000 loops, using time:3838ms
Ok
8> Fg_sql_inf:prof (10000).
10000 loops, using time:3994ms
Ok
9> Fg_sql_inf:prof (10000).
10000 loops, using time:4009ms
Ok
10> Fg_sql_inf:prof (10000).
10000 loops, using TIME:3853MS
Ok
11> Fg_sql_inf:prof (10000).
10000 loops, using time:3838ms
Ok
12> Fg_sql_inf:prof (10000).
10000 loops, using time:3947ms
Ok
13> Fg_sql_inf:prof (10000).
10000 loops, using time:4025ms
Ok
14> Fg_sql_inf:prof (10000).
10000 loops, using time:4025ms
Ok
15> Fg_sql_inf:prof (10000).
10000 loops, using time:3869ms
Ok
16> Fg_sql_inf:prof (10000).
10000 loops, using TIME:3993MS
Ok
17> Fg_sql_inf:prof (10000).
10000 loops, using TIME:3853MS
Ok
18> Fg_sql_inf:prof (10000).
10000 loops, using time:3947ms
Ok
19> fg_sql_inf:prof (100000).
100000 loops, using time:39359ms
Ok
20> fg_sql_inf:prof (100000).
100000 loops, using time:39328ms
Ok
21> fg_sql_inf:prof (100000).
100000 loops, using time:39187ms
Ok
22> fg_sql_inf:prof (100000).
100000 loops, using time:39406ms
Ok
23> fg_sql_inf:prof (100000).
100000 loops, using time:39265ms
Ok
24> fg_sql_inf:prof (100000).
100000 loops, using time:39515ms
Ok

======== without ping (does not include ping) test results ========

2> fg_sql_inf:prof (100).
Loops, using Time:46ms
Ok
3> Fg_sql_inf:prof (10000).
10000 loops, using time:2308ms
Ok
4> Fg_sql_inf:prof (10000).
10000 loops, using time:2402ms
Ok
5> Fg_sql_inf:prof (10000).
10000 loops, using time:2418ms
Ok
6> Fg_sql_inf:prof (10000).
10000 loops, using time:2419ms
Ok
7> Fg_sql_inf:prof (10000).
10000 loops, using time:2417ms
Ok
8> Fg_sql_inf:prof (10000).
10000 loops, using time:2419ms
Ok
9> Fg_sql_inf:prof (10000).
10000 loops, using time:2294ms
Ok
10> Fg_sql_inf:prof (10000).
10000 loops, using time:2417ms
Ok
11> Fg_sql_inf:prof (10000).
10000 loops, using time:2479ms
Ok
12> Fg_sql_inf:prof (10000).
10000 loops, using TIME:2433MS
Ok
13> Fg_sql_inf:prof (10000).
10000 loops, using TIME:2403MS
Ok
14> fg_sql_inf:prof (100000).
100000 loops, using time:23540ms
Ok
15> fg_sql_inf:prof (100000).
100000 loops, using time:23556ms
Ok
16> fg_sql_inf:prof (100000).
100000 loops, using time:23759ms
Ok
17> fg_sql_inf:prof (100000).
100000 loops, using time:23510ms
Ok
18> fg_sql_inf:prof (100000).
100000 loops, using time:23667ms
Ok
19> fg_sql_inf:prof (100000).
100000 loops, using time:26786ms
Ok
20> fg_sql_inf:prof (100000).
100000 loops, using time:23618ms
Ok
21> fg_sql_inf:prof (100000).
100000 loops, using time:23525ms
Ok

As can be seen, the operation of the ping has a certain effect, after removing the ping, it will probably speed up 80%

Report:

UPDATE_TEST_TBL (_newval)
Table = Just_test,
Tablebin = Atom_to_binary (Table, Latin1),

CMD = << "Update", Tablebin/binary, "Set data = 456" >>

Execute (CMD). % will call Emysql:execute (? POOL, CMD)

Prof (Times)
F = Fun ()
UPDATE_TEST_TBL (1)
End
Run (F, times).

Run (fun, Loop)
Statistics (Wall_clock),
For (1, loops, fun),
{_, T1} = statistics (Wall_clock),
Io:format ("~p loops, using time: ~pms~n", [Loop, T1]),
Ok.

For (Max, Max, fun)
Fun ();
For (I, Max, Fun)
Fun (),

for (I + 1, Max, fun).

Emysql:ping VS without Ping