mirror of
https://github.com/paboyle/Grid.git
synced 2024-09-20 09:15:38 +01:00
98 lines
2.1 KiB
C++
98 lines
2.1 KiB
C++
#include <Grid/GridCore.h>
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#include <fcntl.h>
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namespace Grid {
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int PointerCache::victim;
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PointerCache::PointerCacheEntry PointerCache::Entries[PointerCache::Ncache];
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void *PointerCache::Insert(void *ptr,size_t bytes) {
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if (bytes < 4096 ) return ptr;
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#ifdef GRID_OMP
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assert(omp_in_parallel()==0);
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#endif
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void * ret = NULL;
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int v = -1;
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for(int e=0;e<Ncache;e++) {
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if ( Entries[e].valid==0 ) {
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v=e;
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break;
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}
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}
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if ( v==-1 ) {
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v=victim;
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victim = (victim+1)%Ncache;
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}
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if ( Entries[v].valid ) {
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ret = Entries[v].address;
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Entries[v].valid = 0;
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Entries[v].address = NULL;
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Entries[v].bytes = 0;
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}
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Entries[v].address=ptr;
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Entries[v].bytes =bytes;
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Entries[v].valid =1;
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return ret;
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}
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void *PointerCache::Lookup(size_t bytes) {
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if (bytes < 4096 ) return NULL;
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#ifdef _OPENMP
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assert(omp_in_parallel()==0);
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#endif
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for(int e=0;e<Ncache;e++){
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if ( Entries[e].valid && ( Entries[e].bytes == bytes ) ) {
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Entries[e].valid = 0;
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return Entries[e].address;
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}
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}
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return NULL;
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}
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void check_huge_pages(void *Buf,uint64_t BYTES)
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{
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#ifdef __linux__
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int fd = open("/proc/self/pagemap", O_RDONLY);
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assert(fd >= 0);
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const int page_size = 4096;
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uint64_t virt_pfn = (uint64_t)Buf / page_size;
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off_t offset = sizeof(uint64_t) * virt_pfn;
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uint64_t npages = (BYTES + page_size-1) / page_size;
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uint64_t pagedata[npages];
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uint64_t ret = lseek(fd, offset, SEEK_SET);
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assert(ret == offset);
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ret = ::read(fd, pagedata, sizeof(uint64_t)*npages);
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assert(ret == sizeof(uint64_t) * npages);
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int nhugepages = npages / 512;
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int n4ktotal, nnothuge;
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n4ktotal = 0;
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nnothuge = 0;
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for (int i = 0; i < nhugepages; ++i) {
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uint64_t baseaddr = (pagedata[i*512] & 0x7fffffffffffffULL) * page_size;
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for (int j = 0; j < 512; ++j) {
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uint64_t pageaddr = (pagedata[i*512+j] & 0x7fffffffffffffULL) * page_size;
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++n4ktotal;
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if (pageaddr != baseaddr + j * page_size)
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++nnothuge;
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}
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}
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int rank = CartesianCommunicator::RankWorld();
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printf("rank %d Allocated %d 4k pages, %d not in huge pages\n", rank, n4ktotal, nnothuge);
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#endif
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}
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}
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