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-rw-r--r--seqreader.c28
1 files changed, 19 insertions, 9 deletions
diff --git a/seqreader.c b/seqreader.c
index 1a13cf9..e0afe67 100644
--- a/seqreader.c
+++ b/seqreader.c
@@ -11,8 +11,8 @@
#include <string.h>
#include <errno.h>
-#define BUFSIZE 1048576//65536
-#define BLOCK_SIZE 16384//16384
+#define BUFSIZE 65536
+#define BLOCK_SIZE 16384
#define WRITE_INTERVAL 1
@@ -28,7 +28,9 @@ int main(int argc, char *argv[]) {
size_t last_write = 0;
size_t skip;
size_t run;
+ ssize_t res;
char buffer[BUFSIZE];
+ long double mcoef = 1000000. / (1024 * 1024);
if (argc < 2) {
printf("Usage: %s <directory|device> [skip]\n", argv[0]);
@@ -42,25 +44,33 @@ int main(int argc, char *argv[]) {
exit(1);
}
- int size = BLOCK_SIZE;
+ size_t size = BLOCK_SIZE;
gettimeofday(&start, NULL);
- err = read(fd, buffer, size);
- while (err > 0) {
- total_size += err;
+ res = read(fd, buffer, size);
+ while (res > 0) {
+ if (res != size) {
+ printf("Incomplete read: %zu bytes read instead of %zu\n", res, size);
+ exit(-1);
+ }
+ total_size += res;
gettimeofday(&tv, NULL);
us = (tv.tv_sec - start.tv_sec) * 1000000 + (tv.tv_usec - start.tv_usec);
if ((us - last_write) > WRITE_INTERVAL * 1000000) {
last_write = us;
- printf("Reading: %s (%lu GB), Measured speed: %lu mB/s\n", argv[0], total_size / 1024 / 1024 / 1024, total_size / us);
+ printf("Reading: %s (%lu GB), Measured speed: %zu MB/s\n", argv[0], total_size / 1024 / 1024 / 1024, (size_t)(mcoef * total_size / us));
}
- err = read(fd, buffer, size);
+ res = read(fd, buffer, size);
}
close(fd);
+ if (res < 0) {
+ printf("Read failed with errno %i\n", errno);
+ exit(-1);
+ }
return 0;
}
@@ -110,7 +120,7 @@ int main(int argc, char *argv[]) {
gettimeofday(&tv, NULL);
us = (tv.tv_sec - start.tv_sec) * 1000000 + (tv.tv_usec - start.tv_usec);
- printf("Reading: %s (%lu MB), Read: %lu files (%lu GB), Measured speed: %lu mB/s\n", ent->d_name, st.st_size/1024/1024, files, total_size / 1024 / 1024 / 1024, total_size / us);
+ printf("Reading: %s (%lu MB), Read: %lu files (%lu GB), Measured speed: %zu MB/s\n", ent->d_name, st.st_size/1024/1024, files, total_size / 1024 / 1024 / 1024, (size_t)(mcoef * total_size / us));
}
closedir(dir);
}