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prime the sam ldb schema in the parent samba process

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While testing the use of the standard process model with 'make test' I
found that testing was much slower (by several times) with the
standard model than with the single model. The primary problem was
that each SMB connection would open a new sam ldb context, and all of
those would reload the full AD schema.

The fix is to pre-open the SAM during server startup, before any child
processes are forked. This sets up the global schema context which is
inherited by all connections.

The standard model is still slower at make test than the single model,
but not by nearly as much. I am working on further reducing the gap.
This commit is contained in:
Andrew Tridgell 2009-08-07 17:19:39 +10:00
parent 2c12c985e7
commit cfc0cabb27
1 changed files with 18 additions and 0 deletions
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18
source4/smbd/server.c
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@ -38,6 +38,8 @@
#include "param/secrets.h"
#include "smbd/pidfile.h"
#include "param/param.h"
#include "dsdb/samdb/samdb.h"
#include "auth/session.h"
/*
recursively delete a directory tree
@ -112,6 +114,7 @@ static void sig_term(int sig)
kill(-getpgrp(), SIGTERM);
}
#endif
DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
exit(0);
}
@ -157,6 +160,7 @@ static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent
DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
#if HAVE_GETPGRP
if (getpgrp() == getpid()) {
DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
kill(-getpgrp(), SIGTERM);
}
#endif
@ -176,6 +180,18 @@ _NORETURN_ static void max_runtime_handler(struct tevent_context *ev,
exit(0);
}
/*
pre-open the sam ldb to ensure the schema has been loaded. This
saves a lot of time in child processes
*/
static void prime_samdb_schema(struct tevent_context *event_ctx)
{
TALLOC_CTX *samdb_context;
samdb_context = talloc_new(event_ctx);
samdb_connect(samdb_context, event_ctx, cmdline_lp_ctx, system_session(samdb_context, cmdline_lp_ctx));
talloc_free(samdb_context);
}
/*
main server.
*/
@ -344,6 +360,8 @@ static int binary_smbd_main(const char *binary_name, int argc, const char *argv[
discard_const(binary_name));
}
prime_samdb_schema(event_ctx);
DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
lp_server_services(cmdline_lp_ctx));