memory-map

Why is memory area $1020 unwriteable on M68HC12 with staa?

I have the following asm code: org $1000 ;Table Origin is at $1000 fcb $02,$04,$06,$08 ; values of table from $1001 - $1004 fcb $0a,$0c,$0e,$10 ; values of table from $1005 - $1009 org $400 ; Program Start lds #$4000 ; Set Stack Pointer at value (#) $4000 ldy #$1000 ; ...

Is there any useful information in the memory map after a crash

I get a crash (i.e. abort) as follows and wanted to know if there's anything that I can get from the memory map information provided that could be useful? ___________ *** glibc detected *** free(): invalid pointer: 0x000000000070f0c0 *** ======= Backtrace: ========= /lib64/libc.so.6[0x7f4f2ee88cb8] /lib64/libc.so.6(cfree+0x76)[0x7f4f...

Does it make sense to cache data obtained from a memory mapped file?

Or it would be faster to re-read that data from mapped memory once again, since the OS might implement its own cache? The nature of data is not known in advance, it is assumed that file reads are random. ...

Looking for more details about memory map in MongoDB

Hi I am looking for more details/docs or anything else about 'memory map mechanism' in MongoDB, and wondering how they use this to achieve high performance. Anyone could help? Thanks in advance~ ...