Comments (4)
Update... I tried just mapping the file as 1gb chunks and I run into the same error after gig number 2...
*note, mapping the file works fine with python's numpy.memmap
Codez:
`// const file = path.join( remote.app.getAppPath(), 'pointclouds', 'las', 'test.las' )
const file = path.join( remote.app.getAppPath(), 'test.tif' )
const size = fs.statSync( file ).size
const fd = fs.openSync( file, 'r' )
const pages = []
const bufferSize = 2**30
console.time('test')
for ( let offset = 0; offset < size; offset+=bufferSize ) {
console.log( 'start:', offset )
let pageSize = bufferSize;
if ( pageSize > size ) {
pageSize = size % bufferSize
}
console.log( pageSize )
const protection = window.MMAP.PROT_READ
const privacy = window.MMAP.MAP_PRIVATE
const advise = window.MMAP.MADV_RANDOM
const buffer = window.MMAP.map( pageSize, protection, privacy, fd, offset, advise )
pages.push( buffer )
console.log( 'end:', offset + pageSize )
console.log( '\n\n' )
}
console.timeEnd('test')`
results in:
Uncaught Error: mmap failed, 0
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Another update... If I allocate 4 1gb buffers on the same file starting at offset 0, there is also no issue. It seems like maybe the issue is the number being passed into either offset or size?
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@ozra So I actually fixed this by changing the type of the input arguments for size and offset to long longs.... idk if this breaks things on other architectures, but posting my answer here for anyone that runs into a similar problem.
`
constexpr void* hinted_address = nullptr; // Just making things uber-clear...
const size_t size = static_cast<size_t>(get_v<long long>(info[0]));
const int protection = get_v<int>(info[1]);
const int flags = get_v<int>(info[2]);
const int fd = get_v<int>(info[3]);
const size_t offset = static_cast<size_t>(get_v<long long>(info[4], 0));
const int advise = get_v<int>(info[5], 0);
`
*disclaimer, I haven't written C plus plus in like 5 years so be cautious
from mmap-io.
We made https://github.com/ipinfo/mmap-utils with a fix for this.
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Related Issues (19)
- nan dependency version HOT 7
- npm install fails on Windows HOT 14
- Module is not Context-Aware. Creates module registration error with node js worker threads HOT 5
- Compiler warnings b/c V8 changes. Consider "node_addon_api" over "NAN"
- After upgrade to 1.1.0, the module cannot be imported HOT 7
- Readme reference Make HOT 1
- Invalid arg type The "path" argument must be one of type string, Buffer or URL. Received type number. HOT 1
- Can this do memory mapped not to file (e.g. not persisted/stored to/from disk)? HOT 2
- Current NAN fails for node 12.6.0, time for beast coding
- Ability to get SharedArrayBuffer instead of ArrayBuffer
- Ability to explicitly unmap
- Release new version from latest master HOT 2
- TypeScript api sample?
- Bus error if 'offset' of mmap is greater than 2gb. HOT 1
- Build folder is empty and compatibility with phone apps
- Add minimal node example to Readme
- windows: incorrect split between high and low for position and offset HOT 3
- windows: always creating paging mapping, not file mapping HOT 2
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