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authorSuren A. Chilingaryan <csa@dside.dyndns.org>2012-04-15 06:01:44 +0200
committerSuren A. Chilingaryan <csa@dside.dyndns.org>2012-04-15 06:01:44 +0200
commit133aa259230f293e59b8b013f9fd2ac8b1c03b05 (patch)
tree44ca4ebf737b72d22f0f89711221614bb4f020c3 /seqreader.c
parent434198173720c2e8f5c79e8c00790b250e5a1942 (diff)
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Use O_DIRECT mode in seqreader
Diffstat (limited to 'seqreader.c')
-rw-r--r--seqreader.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/seqreader.c b/seqreader.c
index 68bcdca..f2128e2 100644
--- a/seqreader.c
+++ b/seqreader.c
@@ -11,8 +11,10 @@
#include <string.h>
#include <errno.h>
-#define BUFSIZE 65536
-#define BLOCK_SIZE 16384
+#define FASTWRITER_SYNCIO_ALIGN 512
+
+#define BUFSIZE 2097152
+#define BLOCK_SIZE 2097152
#define WRITE_INTERVAL 1
@@ -29,16 +31,18 @@ int main(int argc, char *argv[]) {
size_t skip;
size_t run;
ssize_t res;
- char buffer[BUFSIZE];
+ char *buffer;//[BUFSIZE];
long double mcoef = 1000000. / (1024 * 1024);
+ posix_memalign((void**)&buffer, FASTWRITER_SYNCIO_ALIGN, BUFSIZE);
+
if (argc < 2) {
printf("Usage: %s <directory|device> [skip]\n", argv[0]);
exit(0);
}
if (strstr(argv[1], "/dev/")) {
- int fd = open(argv[1], O_RDONLY|O_NOATIME|O_LARGEFILE/*|O_DIRECT*/, 0);
+ int fd = open(argv[1], O_RDONLY|O_NOATIME|O_LARGEFILE|O_DIRECT, 0);
if (fd < 0) {
printf("Unable to open device %s\n", argv[1]);
exit(1);
@@ -72,6 +76,8 @@ int main(int argc, char *argv[]) {
exit(-1);
}
+ free(buffer);
+
return 0;
}
@@ -124,5 +130,7 @@ int main(int argc, char *argv[]) {
}
closedir(dir);
}
+
+ free(buffer);
} \ No newline at end of file