Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commit0d9e0d9

Browse files
committed
Copy fsync() defines into test_fsync.c, someday place them in an
include.Propery align for O_DIRECT.Check for write()/fsync() failures.
1 parentf14d43d commit0d9e0d9

File tree

1 file changed

+136
-41
lines changed

1 file changed

+136
-41
lines changed

‎src/tools/fsync/test_fsync.c

Lines changed: 136 additions & 41 deletions
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,12 @@
11
/*
22
*test_fsync.c
3-
*tests if fsync can be done from another process than the original write
3+
*test various fsync() methods
44
*/
55

6-
#include"../../include/pg_config.h"
7-
#include"../../include/pg_config_os.h"
6+
#include"postgres.h"
7+
8+
#include"access/xlog_internal.h"
9+
#include"access/xlog.h"
810

911
#include<sys/types.h>
1012
#include<sys/stat.h>
@@ -14,29 +16,94 @@
1416
#include<time.h>
1517
#include<sys/time.h>
1618
#include<unistd.h>
19+
#include<string.h>
1720

18-
#ifdefWIN32
19-
#defineFSYNC_FILENAME"./test_fsync.out"
21+
/* ---------------------------------------------------------------
22+
*Copied from xlog.c. Some day this should be moved an include file.
23+
*/
24+
25+
/*
26+
*Because O_DIRECT bypasses the kernel buffers, and because we never
27+
*read those buffers except during crash recovery, it is a win to use
28+
*it in all cases where we sync on each write().We could allow O_DIRECT
29+
*with fsync(), but because skipping the kernel buffer forces writes out
30+
*quickly, it seems best just to use it for O_SYNC. It is hard to imagine
31+
*how fsync() could be a win for O_DIRECT compared to O_SYNC and O_DIRECT.
32+
*Also, O_DIRECT is never enough to force data to the drives, it merely
33+
*tries to bypass the kernel cache, so we still need O_SYNC or fsync().
34+
*/
35+
#ifdefO_DIRECT
36+
#definePG_O_DIRECTO_DIRECT
2037
#else
21-
#defineFSYNC_FILENAME"/var/tmp/test_fsync.out"
38+
#definePG_O_DIRECT0
2239
#endif
2340

24-
/* O_SYNC and O_FSYNC are the same */
41+
/*
42+
* This chunk of hackery attempts to determine which file sync methods
43+
* are available on the current platform, and to choose an appropriate
44+
* default method.We assume that fsync() is always available, and that
45+
* configure determined whether fdatasync() is.
46+
*/
2547
#if defined(O_SYNC)
26-
#defineOPEN_SYNC_FLAGO_SYNC
48+
#defineBARE_OPEN_SYNC_FLAGO_SYNC
2749
#elif defined(O_FSYNC)
28-
#defineOPEN_SYNC_FLAGO_FSYNC
29-
#elif defined(O_DSYNC)
30-
#defineOPEN_DATASYNC_FLAGO_DSYNC
50+
#defineBARE_OPEN_SYNC_FLAGO_FSYNC
51+
#endif
52+
#ifdefBARE_OPEN_SYNC_FLAG
53+
#defineOPEN_SYNC_FLAG(BARE_OPEN_SYNC_FLAG | PG_O_DIRECT)
3154
#endif
3255

56+
#if defined(O_DSYNC)
3357
#if defined(OPEN_SYNC_FLAG)
34-
#if defined(O_DSYNC)&& (O_DSYNC!=OPEN_SYNC_FLAG)
35-
#defineOPEN_DATASYNC_FLAGO_DSYNC
58+
/* O_DSYNC is distinct? */
59+
#ifO_DSYNC!=BARE_OPEN_SYNC_FLAG
60+
#defineOPEN_DATASYNC_FLAG(O_DSYNC | PG_O_DIRECT)
61+
#endif
62+
#else/* !defined(OPEN_SYNC_FLAG) */
63+
/* Win32 only has O_DSYNC */
64+
#defineOPEN_DATASYNC_FLAG(O_DSYNC | PG_O_DIRECT)
65+
#endif
66+
#endif
67+
68+
#if defined(OPEN_DATASYNC_FLAG)
69+
#defineDEFAULT_SYNC_METHOD_STR "open_datasync"
70+
#defineDEFAULT_SYNC_METHODSYNC_METHOD_OPEN
71+
#defineDEFAULT_SYNC_FLAGBITOPEN_DATASYNC_FLAG
72+
#elif defined(HAVE_FDATASYNC)
73+
#defineDEFAULT_SYNC_METHOD_STR "fdatasync"
74+
#defineDEFAULT_SYNC_METHODSYNC_METHOD_FDATASYNC
75+
#defineDEFAULT_SYNC_FLAGBIT0
76+
#elif defined(HAVE_FSYNC_WRITETHROUGH_ONLY)
77+
#defineDEFAULT_SYNC_METHOD_STR "fsync_writethrough"
78+
#defineDEFAULT_SYNC_METHODSYNC_METHOD_FSYNC_WRITETHROUGH
79+
#defineDEFAULT_SYNC_FLAGBIT0
80+
#else
81+
#defineDEFAULT_SYNC_METHOD_STR "fsync"
82+
#defineDEFAULT_SYNC_METHODSYNC_METHOD_FSYNC
83+
#defineDEFAULT_SYNC_FLAGBIT0
84+
#endif
85+
86+
87+
/*
88+
* Limitation of buffer-alignment for direct IO depends on OS and filesystem,
89+
* but XLOG_BLCKSZ is assumed to be enough for it.
90+
*/
91+
#ifdefO_DIRECT
92+
#defineALIGNOF_XLOG_BUFFERXLOG_BLCKSZ
93+
#else
94+
#defineALIGNOF_XLOG_BUFFERALIGNOF_BUFFER
3695
#endif
96+
97+
/* ------------ from xlog.c --------------- */
98+
99+
#ifdefWIN32
100+
#defineFSYNC_FILENAME"./test_fsync.out"
101+
#else
102+
/* /tmp might be a memory file system */
103+
#defineFSYNC_FILENAME"/var/tmp/test_fsync.out"
37104
#endif
38105

39-
#defineWAL_FILE_SIZE(16 * 1024 * 1024)
106+
#defineWRITE_SIZE(16 * 1024)
40107

41108
voiddie(char*str);
42109
voidprint_elapse(structtimevalstart_t,structtimevalelapse_t);
@@ -49,7 +116,7 @@ main(int argc, char *argv[])
49116
inttmpfile,
50117
i,
51118
loops=1000;
52-
char*strout= (char*)malloc(WAL_FILE_SIZE);
119+
char*full_buf= (char*)malloc(XLOG_SEG_SIZE),*buf;
53120
char*filename=FSYNC_FILENAME;
54121

55122
if (argc>2&&strcmp(argv[1],"-f")==0)
@@ -62,23 +129,29 @@ main(int argc, char *argv[])
62129
if (argc>1)
63130
loops=atoi(argv[1]);
64131

65-
for (i=0;i<WAL_FILE_SIZE;i++)
66-
strout[i]='a';
132+
for (i=0;i<XLOG_SEG_SIZE;i++)
133+
full_buf[i]='a';
67134

68135
if ((tmpfile=open(filename,O_RDWR |O_CREAT,S_IRUSR |S_IWUSR))==-1)
69136
die("Cannot open output file.");
70-
write(tmpfile,strout,WAL_FILE_SIZE);
71-
fsync(tmpfile);/* fsync so later fsync's don't have to do it */
137+
if (write(tmpfile,full_buf,XLOG_SEG_SIZE)!=XLOG_SEG_SIZE)
138+
die("write failed");
139+
/* fsync so later fsync's don't have to do it */
140+
if (fsync(tmpfile)!=0)
141+
die("fsync failed");
72142
close(tmpfile);
73143

144+
buf= (char*)TYPEALIGN(ALIGNOF_XLOG_BUFFER,full_buf);
145+
74146
printf("Simple write timing:\n");
75147
/* write only */
76148
gettimeofday(&start_t,NULL);
77149
for (i=0;i<loops;i++)
78150
{
79151
if ((tmpfile=open(filename,O_RDWR))==-1)
80152
die("Cannot open output file.");
81-
write(tmpfile,strout,8192);
153+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
154+
die("write failed");
82155
close(tmpfile);
83156
}
84157
gettimeofday(&elapse_t,NULL);
@@ -95,8 +168,10 @@ main(int argc, char *argv[])
95168
{
96169
if ((tmpfile=open(filename,O_RDWR))==-1)
97170
die("Cannot open output file.");
98-
write(tmpfile,strout,8192);
99-
fsync(tmpfile);
171+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
172+
die("write failed");
173+
if (fsync(tmpfile)!=0)
174+
die("fsync failed");
100175
close(tmpfile);
101176
if ((tmpfile=open(filename,O_RDWR))==-1)
102177
die("Cannot open output file.");
@@ -114,12 +189,14 @@ main(int argc, char *argv[])
114189
{
115190
if ((tmpfile=open(filename,O_RDWR))==-1)
116191
die("Cannot open output file.");
117-
write(tmpfile,strout,8192);
192+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
193+
die("write failed");
118194
close(tmpfile);
119195
/* reopen file */
120196
if ((tmpfile=open(filename,O_RDWR))==-1)
121197
die("Cannot open output file.");
122-
fsync(tmpfile);
198+
if (fsync(tmpfile)!=0)
199+
die("fsync failed");
123200
close(tmpfile);
124201
}
125202
gettimeofday(&elapse_t,NULL);
@@ -135,7 +212,8 @@ main(int argc, char *argv[])
135212
die("Cannot open output file.");
136213
gettimeofday(&start_t,NULL);
137214
for (i=0;i<loops;i++)
138-
write(tmpfile,strout,16384);
215+
if (write(tmpfile,buf,WRITE_SIZE)!=WRITE_SIZE)
216+
die("write failed");
139217
gettimeofday(&elapse_t,NULL);
140218
close(tmpfile);
141219
printf("\tone 16k o_sync write ");
@@ -148,8 +226,10 @@ main(int argc, char *argv[])
148226
gettimeofday(&start_t,NULL);
149227
for (i=0;i<loops;i++)
150228
{
151-
write(tmpfile,strout,8192);
152-
write(tmpfile,strout,8192);
229+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
230+
die("write failed");
231+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
232+
die("write failed");
153233
}
154234
gettimeofday(&elapse_t,NULL);
155235
close(tmpfile);
@@ -169,7 +249,8 @@ main(int argc, char *argv[])
169249
die("Cannot open output file.");
170250
gettimeofday(&start_t,NULL);
171251
for (i=0;i<loops;i++)
172-
write(tmpfile,strout,8192);
252+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
253+
die("write failed");
173254
gettimeofday(&elapse_t,NULL);
174255
close(tmpfile);
175256
printf("\topen o_dsync, write ");
@@ -181,7 +262,8 @@ main(int argc, char *argv[])
181262
die("Cannot open output file.");
182263
gettimeofday(&start_t,NULL);
183264
for (i=0;i<loops;i++)
184-
write(tmpfile,strout,8192);
265+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
266+
die("write failed");
185267
gettimeofday(&elapse_t,NULL);
186268
close(tmpfile);
187269
printf("\topen o_sync, write ");
@@ -199,7 +281,8 @@ main(int argc, char *argv[])
199281
gettimeofday(&start_t,NULL);
200282
for (i=0;i<loops;i++)
201283
{
202-
write(tmpfile,strout,8192);
284+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
285+
die("write failed");
203286
fdatasync(tmpfile);
204287
}
205288
gettimeofday(&elapse_t,NULL);
@@ -217,8 +300,10 @@ main(int argc, char *argv[])
217300
gettimeofday(&start_t,NULL);
218301
for (i=0;i<loops;i++)
219302
{
220-
write(tmpfile,strout,8192);
221-
fsync(tmpfile);
303+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
304+
die("write failed");
305+
if (fsync(tmpfile)!=0)
306+
die("fsync failed");
222307
}
223308
gettimeofday(&elapse_t,NULL);
224309
close(tmpfile);
@@ -235,8 +320,10 @@ main(int argc, char *argv[])
235320
gettimeofday(&start_t,NULL);
236321
for (i=0;i<loops;i++)
237322
{
238-
write(tmpfile,strout,8192);
239-
write(tmpfile,strout,8192);
323+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
324+
die("write failed");
325+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
326+
die("write failed");
240327
}
241328
gettimeofday(&elapse_t,NULL);
242329
close(tmpfile);
@@ -254,8 +341,10 @@ main(int argc, char *argv[])
254341
gettimeofday(&start_t,NULL);
255342
for (i=0;i<loops;i++)
256343
{
257-
write(tmpfile,strout,8192);
258-
write(tmpfile,strout,8192);
344+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
345+
die("write failed");
346+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
347+
die("write failed");
259348
}
260349
gettimeofday(&elapse_t,NULL);
261350
close(tmpfile);
@@ -271,8 +360,10 @@ main(int argc, char *argv[])
271360
gettimeofday(&start_t,NULL);
272361
for (i=0;i<loops;i++)
273362
{
274-
write(tmpfile,strout,8192);
275-
write(tmpfile,strout,8192);
363+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
364+
die("write failed");
365+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
366+
die("write failed");
276367
fdatasync(tmpfile);
277368
}
278369
gettimeofday(&elapse_t,NULL);
@@ -290,16 +381,20 @@ main(int argc, char *argv[])
290381
gettimeofday(&start_t,NULL);
291382
for (i=0;i<loops;i++)
292383
{
293-
write(tmpfile,strout,8192);
294-
write(tmpfile,strout,8192);
295-
fsync(tmpfile);
384+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
385+
die("write failed");
386+
if (write(tmpfile,buf,WRITE_SIZE/2)!=WRITE_SIZE/2)
387+
die("write failed");
388+
if (fsync(tmpfile)!=0)
389+
die("fsync failed");
296390
}
297391
gettimeofday(&elapse_t,NULL);
298392
close(tmpfile);
299393
printf("\twrite, fsync, ");
300394
print_elapse(start_t,elapse_t);
301395
printf("\n");
302396

397+
free(full_buf);
303398
unlink(filename);
304399

305400
return0;

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp