Re: IJG JPEG Engine and Win32

Article View: comp.graphics.algorithms

Article #36

Back to comp.graphics.algorithms Previous Next

#36

From: Brad Wilson
Date: Tue, 23 Jan 1996 17:05

16 lines
1500 bytes

jtara@connectnet.com (Jon Tara) wrote:

>> > Incidently, malloc() and free() are measureably slower under 
>> >Windows 95.  These generate calls to GlobalAlloc which are still in the 
>> >Win32 API just for compatability. Under Win32 you want to use HeapAlloc 
>> >or VirtualAlloc if you can.  

>> I'm not sure that using VirtualAlloc() would be such a good idea,
>> except for large blocks. malloc() and free() grab large blocks and
>> then divvy them up, so most of the time when you call malloc() it
>> doesn't actually go out to the operating system and allocate anything.

This was true in Visual C++ until 4.0.  Now _all_ memory allocation
calls are turned into native calls to the operating system.

Brad

Technical Details

Message-ID: <4e34f7$40e@news2.acs.oakland.edu>

Path: arc1-ca.pugleaf.net!news2.acs.oakland.edu!news

References:

<4cemir$6vb@redstone.interpath.net> <TGL.96Jan3202549@netcom21.netcom.com> <TGL.96Jan5065424@netcom21.netcom.com> <4cpn1r$gm0@redstone.interpath.net> <4crai5$ear@hades.rz.uni-sb.de> <4d11tg$56q@redstone.interpath.net> <310110c0.44581633@news.connectnet.com>

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!news2.acs.oakland.edu!news
From: bradw@exptech.com (Brad Wilson)
Newsgroups: comp.graphics.algorithms,comp.lang.c++,comp.os.ms-windows.programmer.graphics,comp.os.ms-windows.programmer.multimedia,comp.os.ms-windows.programmer.win32
Subject: Re: IJG JPEG Engine and Win32
Date: Tue, 23 Jan 1996 17:05:31 GMT
Organization: Express Technologies Corp.
Message-ID: <4e34f7$40e@news2.acs.oakland.edu>
References: <4cemir$6vb@redstone.interpath.net> <TGL.96Jan3202549@netcom21.netcom.com> <TGL.96Jan5065424@netcom21.netcom.com> <4cpn1r$gm0@redstone.interpath.net> <4crai5$ear@hades.rz.uni-sb.de> <4d11tg$56q@redstone.interpath.net> <310110c0.44581633@news.connectnet.com>
NNTP-Posting-Host: ppp-pm01-dy-12.opr.oakland.edu
X-Newsreader: Forte Free Agent 1.0.82

Reply to Parent Message