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fallocate plot files in background upon creation #46

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fallocate plot files in background upon creation #46

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3c0fe0d
try to fallocate plot files in background
mocksoul Aug 1, 2021
a5dcdec
dont use raw printf, use Log instead
mocksoul Aug 1, 2021
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31 changes: 31 additions & 0 deletions src/platform/unix/FileStream_Unix.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
#include "util/Log.h"

#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>

Expand All @@ -12,6 +13,33 @@ bool FileStream::Open( const char* path, FileMode mode, FileAccess access, FileF
return Open( path, *this, mode, access, flags );
}

void* fallocate_in_background(void* rawfd) {
int fd = *(int*)rawfd;

pthread_detach(pthread_self());

Log::Line("Fallocating files...");
struct timeval begin, end;
gettimeofday(&begin, 0);

off_t fallocate_len = 108447924224; // 101 GiB
int res = fallocate(fd, 0, 0, fallocate_len);

gettimeofday(&end, 0);

if (res < 0) {
Log::Line("Fallocate failed, errno %d", errno);
} else {
long seconds = end.tv_sec - begin.tv_sec;
long microseconds = end.tv_usec - begin.tv_usec;
double elapsed = seconds + microseconds*1e-6;

Log::Line("Fallocate succeeded in %.2f seconds.", elapsed);
}

pthread_exit(nullptr);
}

//----------------------------------------------------------
bool FileStream::Open( const char* path, FileStream& file, FileMode mode, FileAccess access, FileFlags flags )
{
Expand Down Expand Up @@ -47,6 +75,9 @@ bool FileStream::Open( const char* path, FileStream& file, FileMode mode, FileAc
if( fd < 0 )
return false;

pthread_t t;
pthread_create(&t, NULL, fallocate_in_background, &fd);

#if PLATFORM_IS_MACOS
if( IsFlagSet( flags, FileFlags::NoBuffering ) )
{
Expand Down