Bug 691579

Summary:	mupdf fails to release memory of previous pages
Product:	MuPDF	Reporter:	Graham Gower <graham.gower>
Component:	apps	Assignee:	Tor Andersson <tor.andersson>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	P4
Version:	unspecified
Hardware:	All
OS:	Linux
Customer:		Word Size:	---

Description Graham Gower 2010-08-27 05:30:52 UTC

Memory usage gradually climbs when navigating through a pdf. I'm not sure if this is a bug or a design feature (i.e. cache each page for fast rerendering), but it causes problems on smaller memory machines.

With a long pdf consisting wholly of images, mupdf uses hundreds of MB of ram when navigating through the pages.

Comment 1 Graham Gower 2010-08-31 01:14:33 UTC

Patch below fixes the problem for me.

diff --git a/apps/pdfapp.c b/apps/pdfapp.c
index 1393d4e..54827b8 100644
--- a/apps/pdfapp.c
+++ b/apps/pdfapp.c
@@ -274,6 +274,8 @@ static void pdfapp_showpage(pdfapp_t *app, int loadpage, int drawpage)
 		/* Zero search hit position */
 		app->hit = -1;
 		app->hitlen = 0;
+
+		pdf_agestore(app->xref->store, 3);
 	}
 
 	if (drawpage)

Comment 2 Tor Andersson 2010-08-31 11:29:46 UTC

Thanks. Patch applied.