Changeset: 0c0746a5f0b9 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/0c0746a5f0b9
Modified Files:
sql/storage/store.c
Branch: Dec2023
Log Message:
Make hot snapshot buffer size configurable, increase the default
The buffer size is configurable with setting 'hot_snapshot_buffer_size'.
The value is in bytes. It must be a multiple of 512.
The default has been increased from 65536 to 1048576.
For example,
mserver5 --set hot_snapshot_buffer_size=2097152
diffs (107 lines):
diff --git a/sql/storage/store.c b/sql/storage/store.c
--- a/sql/storage/store.c
+++ b/sql/storage/store.c
@@ -2615,52 +2615,39 @@ tar_write_data(stream *tarfile, const ch
}
static gdk_return __attribute__((__warn_unused_result__))
-tar_copy_stream(stream *tarfile, const char *path, time_t mtime, stream
*contents, ssize_t size)
-{
- const ssize_t bufsize = 64 * 1024;
- gdk_return ret = GDK_FAIL;
- ssize_t file_size;
- char *buf = NULL;
- ssize_t to_read;
+tar_copy_stream(stream *tarfile, const char *path, time_t mtime, stream
*contents, size_t size, char *buf, size_t bufsize)
+{
+ size_t file_size;
+ size_t to_read;
file_size = getFileSize(contents);
if (file_size < size) {
GDKerror("Have to copy %zd bytes but only %zd exist in %s",
size, file_size, path);
- goto end;
+ return GDK_FAIL;
}
assert( (bufsize % TAR_BLOCK_SIZE) == 0);
assert(bufsize >= TAR_BLOCK_SIZE);
- buf = GDKmalloc(bufsize);
- if (!buf) {
- GDKerror("could not allocate buffer");
- goto end;
- }
if (tar_write_header(tarfile, path, mtime, size) != GDK_SUCCEED)
- goto end;
+ return GDK_FAIL;
to_read = size;
while (to_read > 0) {
- ssize_t chunk = (to_read <= bufsize) ? to_read : bufsize;
+ size_t chunk = (to_read <= bufsize) ? to_read : bufsize;
ssize_t nbytes = mnstr_read(contents, buf, 1, chunk);
- if (nbytes != chunk) {
+ if (nbytes != (ssize_t)chunk) {
GDKerror("Read only %zd/%zd bytes of component %s: %s",
nbytes, chunk, path, mnstr_peek_error(contents));
- goto end;
- }
- ret = tar_write(tarfile, buf, chunk);
- if (ret != GDK_SUCCEED)
- goto end;
+ return GDK_FAIL;
+ }
+ if (tar_write(tarfile, buf, chunk) != GDK_SUCCEED)
+ return GDK_FAIL;
to_read -= chunk;
}
- ret = GDK_SUCCEED;
-end:
- if (buf)
- GDKfree(buf);
- return ret;
+ return GDK_SUCCEED;
}
static gdk_return __attribute__((__warn_unused_result__))
@@ -2679,6 +2666,20 @@ hot_snapshot_write_tar(stream *out, cons
char dest_path[100]; // size imposed by tar format.
char *dest_name = dest_path + snprintf(dest_path, sizeof(dest_path),
"%s/", prefix);
stream *infile = NULL;
+ const char *bufsize_env_var = "hot_snapshot_buffer_size";
+ int bufsize = GDKgetenv_int(bufsize_env_var, 1024 * 1024);
+ char *buffer = NULL;
+
+ if (bufsize < TAR_BLOCK_SIZE || (bufsize % TAR_BLOCK_SIZE) != 0) {
+ GDKerror("invalid value for setting %s=%d: must be a multiple
of %d",
+ bufsize_env_var, bufsize, TAR_BLOCK_SIZE);
+ goto end;
+ }
+ buffer = GDKmalloc(bufsize);
+ if (!buffer) {
+ GDKerror("could not allocate buffer");
+ goto end;
+ }
lng timeoffset = 0;
QryCtx *qry_ctx = MT_thread_get_qry_ctx();
@@ -2712,7 +2713,7 @@ hot_snapshot_write_tar(stream *out, cons
GDKerror("%s", mnstr_peek_error(NULL));
goto end;
}
- if (tar_copy_stream(out, dest_path, timestamp,
infile, size) != GDK_SUCCEED)
+ if (tar_copy_stream(out, dest_path, timestamp,
infile, size, buffer, (size_t)bufsize) != GDK_SUCCEED)
goto end;
close_stream(infile);
infile = NULL;
@@ -2738,6 +2739,7 @@ hot_snapshot_write_tar(stream *out, cons
end:
free(plan);
+ GDKfree(buffer);
if (infile)
close_stream(infile);
return ret;
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