From 6c8b464ab6bbfa954c7770df135ea5621250045b Mon Sep 17 00:00:00 2001
From: Stelian Pop <stelian@popies.net>
Date: Wed, 27 Feb 2002 09:47:48 +0000
Subject: [PATCH] Do not seek for every dump block, only for each ntrec blocks.

---
 CHANGES     |  7 ++++++-
 dump/tape.c | 12 ++++++++----
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/CHANGES b/CHANGES
index 776bedf..d073757 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,4 @@
-$Id: CHANGES,v 1.165 2002/02/25 13:54:52 stelian Exp $
+$Id: CHANGES,v 1.166 2002/02/27 09:47:48 stelian Exp $
 
 Changes between versions 0.4b27 and 0.4b28 (released ?????????????????)
 =======================================================================
@@ -18,6 +18,11 @@ Changes between versions 0.4b27 and 0.4b28 (released ?????????????????)
 	version...). Thanks to Andrew Donkin <ard@waikato.ac.nz> for
 	reporting the build failures.
 
+4.	Fixed a performance problem with the QFA file creation in
+	dump, which made unnecessary seeks on the tape slowing down
+	the dump. Thanks to Andrew Donkin <ard@waikato.ac.nz> for
+	reporting this issue.
+
 Changes between versions 0.4b26 and 0.4b27 (released February 15, 2002)
 =======================================================================
 
diff --git a/dump/tape.c b/dump/tape.c
index 125b158..97565d1 100644
--- a/dump/tape.c
+++ b/dump/tape.c
@@ -41,7 +41,7 @@
 
 #ifndef lint
 static const char rcsid[] =
-	"$Id: tape.c,v 1.63 2002/02/21 09:25:31 stelian Exp $";
+	"$Id: tape.c,v 1.64 2002/02/27 09:47:48 stelian Exp $";
 #endif /* not lint */
 
 #include <config.h>
@@ -1234,6 +1234,7 @@ doslave(int cmd, int slave_number, int first)
 #ifdef USE_QFA
 		if (gTapeposfd >= 0) {
 			int i;
+			int firstpass = 1;
 			for (i = 0; i < ntrec; ++i) {
 				uspclptr = (union u_spcl *)&slp->tblock[i];
 				spclptr = &uspclptr->s_spcl;
@@ -1243,10 +1244,13 @@ doslave(int cmd, int slave_number, int first)
 				    (spclptr->c_date == gThisDumpDate)) {
 					/* if an error occured previously don't
 					 * try again */
-					if (gtperr == 0) {
-						if ((gtperr = GetTapePos(&curtapepos)) == 0)
-							MkTapeString(spclptr, curtapepos);
+					if (firstpass) {
+						firstpass = 0;
+						if (gtperr == 0) 
+							gtperr = GetTapePos(&curtapepos);
 					}
+					if (gtperr == 0)
+							MkTapeString(spclptr, curtapepos);
 				}
 			}
 		}
-- 
2.39.5