Article View: comp.windows.ms.programmer
Article #1714Big allocations bite the big one?
From: Martin Romano
Date: Mon, 18 Mar 1991 18:41
Date: Mon, 18 Mar 1991 18:41
27 lines
1463 bytes
1463 bytes
Is there a limit on the size of a memory block allocated by GlobalAlloc()
*other* than:
1) 1MB in standard mode
2) 64MB in 386 enhanced mode
3) available virtual memory
When I attempt to allocate an 18MB block*, GlobalAlloc() returns a non-zero
handle, but appears to allocate a block slightly smaller than 16MB.
For example:
HANDLE hBig = GlobalAlloc(GMEM_MOVEABLE, EighteenMegs);
char _huge *hpBig = (char _huge *)GlobalLock(hBig);
...
dwSize = GlobalSize(hBig); /* dwSize < 16MB !!! */;
for (i = 0; i < EighteenMegs; i++)
*hpBig++ = 'X'; /* Dies around 16MB past start of block. */
My apologies if this is a well-known/much-discussed problem.
* My machine is a Compaq 386/25 with 8MB+640KB memory, ~31MB swap file,
with Windows running in enhanced mode.
--
Martin Romano Interactive Systems, Cambridge MA (617)661-7474 x209
{encore, harvard, spdcc, think}!ima!martinr martinr@ima.ima.isc.com
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arc1-ca.pugleaf.net!utzoo!news-server.csri.toronto.edu!rpi!usc!snorkelwacker.mit.edu!hsdndev!spdcc!dirtydog!ima.isc.com!martinrShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!news-server.csri.toronto.edu!rpi!usc!snorkelwacker.mit.edu!hsdndev!spdcc!dirtydog!ima.isc.com!martinr From: martinr@ima.isc.com (Martin Romano) Newsgroups: comp.windows.ms.programmer Subject: Big allocations bite the big one? Message-ID: <1991Mar18.184114.29112@ima.isc.com> Date: 18 Mar 91 18:41:14 GMT Sender: usenet@ima.isc.com Reply-To: martinr@ima.isc.com (Martin Romano) Organization: Interactive Systems, Cambridge, MA 02138-5302 Lines: 27 Originator: martinr@starfish.ima.isc.com