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zdump: Increase output buffer from 8 pages to 1 Mb

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Increase the auxiliary buffer size from 8 pages to 1 megabyte in order to
significantly increase compressed dump processing speed.
For uncompressed dumps, the effect is minor.

Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Mikhail Zaslonko
2023-03-01 11:45:41 +01:00
committed by Jan Höppner
parent 271b809495
commit 14a79eb142
1 changed files with 5 additions and 2 deletions
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7
zdump/output.c
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@@ -14,10 +14,12 @@
#include "dfo.h"
#include "output.h"
#define BUFFER_SIZE (1 * MIB)
int write_dump(FILE *stream)
{
const u64 output_size = dfo_size();
char buf[8UL * PAGE_SIZE];
char *buf = zg_alloc(BUFFER_SIZE);
u64 written = 0;
if (!dfi_feat_copy())
@@ -31,7 +33,7 @@ int write_dump(FILE *stream)
size_t rc;
u64 cnt;
cnt = dfo_read(buf, sizeof(buf));
cnt = dfo_read(buf, BUFFER_SIZE);
rc = fwrite(buf, cnt, 1, stream);
if (rc != 1 && ferror(stream))
ERR_EXIT("Error: Write failed");
@@ -40,5 +42,6 @@ int write_dump(FILE *stream)
};
STDERR("\n");
STDERR("Success: Dump has been copied\n");
zg_free(buf);
return 0;
}