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Allow ShowBufferUsage() to report the number of reads/writes that have

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occurred to temporary files.  This replaces the unused
NDirectFileRead/NDirectFileWrite counters.

Itagaki Takahiro
This commit is contained in:
Tom Lane
2008-09-17 13:15:55 +00:00
parent 32f159cc55
commit 35c2a3c3cf
5 changed files with 17 additions and 29 deletions
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4
src/backend/storage/buffer/buf_init.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.80 2008/01/01 19:45:51 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.81 2008/09/17 13:15:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -29,6 +29,8 @@ long int BufferHitCount;
long int LocalBufferHitCount;
long int BufferFlushCount;
long int LocalBufferFlushCount;
long int BufFileReadCount;
long int BufFileWriteCount;
/*

14
src/backend/storage/buffer/bufmgr.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.237 2008/08/11 11:05:11 heikki Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.238 2008/09/17 13:15:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -64,12 +64,6 @@ bool zero_damaged_pages = false;
int bgwriter_lru_maxpages = 100;
double bgwriter_lru_multiplier = 2.0;
long NDirectFileRead; /* some I/O's are direct file access. bypass
* bufmgr */
long NDirectFileWrite; /* e.g., I/O in psort and hashjoin. */
/* local state for StartBufferIO and related functions */
static volatile BufferDesc *InProgressBuf = NULL;
static bool IsForInput;
@@ -1572,7 +1566,7 @@ ShowBufferUsage(void)
ReadLocalBufferCount - LocalBufferHitCount, LocalBufferFlushCount, localhitrate);
appendStringInfo(&str,
"!\tDirect blocks: %10ld read, %10ld written\n",
NDirectFileRead, NDirectFileWrite);
BufFileReadCount, BufFileWriteCount);
return str.data;
}
@@ -1586,8 +1580,8 @@ ResetBufferUsage(void)
LocalBufferHitCount = 0;
ReadLocalBufferCount = 0;
LocalBufferFlushCount = 0;
NDirectFileRead = 0;
NDirectFileWrite = 0;
BufFileReadCount = 0;
BufFileWriteCount = 0;
}
/*

7
src/backend/storage/file/buffile.c
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.31 2008/05/02 01:08:27 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.32 2008/09/17 13:15:55 tgl Exp $
*
* NOTES:
*
@@ -36,6 +36,7 @@
#include "storage/fd.h"
#include "storage/buffile.h"
#include "storage/buf_internals.h"
/*
* We break BufFiles into gigabyte-sized segments, regardless of RELSEG_SIZE.
@@ -238,6 +239,8 @@ BufFileLoadBuffer(BufFile *file)
file->nbytes = 0;
file->offsets[file->curFile] += file->nbytes;
/* we choose not to advance curOffset here */
BufFileReadCount++;
}
/*
@@ -300,6 +303,8 @@ BufFileDumpBuffer(BufFile *file)
file->offsets[file->curFile] += bytestowrite;
file->curOffset += bytestowrite;
wpos += bytestowrite;
BufFileWriteCount++;
}
file->dirty = false;