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@ -3,6 +3,7 @@
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#include <sys/mman.h> |
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void iob_prefetch(io_batch* b,uint64 bytes) { |
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volatile char x; |
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iob_entry* e,* last; |
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if (b->bytesleft==0) return; |
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last=(iob_entry*)(((char*)array_start(&b->b))+array_bytes(&b->b)); |
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@ -13,13 +14,12 @@ void iob_prefetch(io_batch* b,uint64 bytes) {
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char* c,* d; |
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uint64 before=bytes; |
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if (e->n>=1000000) { |
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d=c=mmap(0,bytes,PROT_READ,MAP_SHARED,e->fd,(e->offset|4095)+1); |
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d=c=mmap(0,bytes+4095,PROT_READ,MAP_SHARED,e->fd,(e->offset|4095)+1); |
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if (c!=MAP_FAILED) { |
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while (bytes>4096) { |
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volatile char x=*d; |
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x=*d; |
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bytes-=4096; |
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d+=4096; |
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(void)x; |
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} |
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} |
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munmap(c,before); |
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@ -27,4 +27,5 @@ void iob_prefetch(io_batch* b,uint64 bytes) {
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return; |
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} |
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} |
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(void)x; |
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} |
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