/*------------------------------------------------------------------------- * Copyright (C) 1997 National Center for Supercomputing Applications. * All rights reserved. * *------------------------------------------------------------------------- * * Created: hdf5cache.c * Jul 9 1997 * Robb Matzke * * Purpose: Functions in this file implement a cache for * things which exist on disk. All "things" associated * with a particular HDF file share the same cache; each * HDF file has it's own cache. * * Modifications: * * Robb Matzke, 4 Aug 1997 * Added calls to H5E. * *------------------------------------------------------------------------- */ #include #include #include #include /* * Sorting the cache by address before flushing is sometimes faster * than flushing in cache order. */ /* #define H5AC_SORT_BY_ADDR */ /* * Private file-scope variables. */ #define PABLO_MASK H5AC_mask #define INTERFACE_INIT NULL static intn interface_initialize_g = 0; #ifdef H5AC_SORT_BY_ADDR static H5AC_t *current_cache_g = NULL; /*for sorting */ #endif /*------------------------------------------------------------------------- * Function: H5AC_create * * Purpose: Initialize the cache just after a file is opened. The * SIZE_HINT is the number of cache slots desired. If you * pass an invalid value then H5AC_NSLOTS is used. You can * turn off caching by using 1 for the SIZE_HINT value. * * Return: Success: Number of slots actually used. * * Failure: Negative * * Programmer: Robb Matzke * matzke@llnl.gov * Jul 9 1997 * * Modifications: * *------------------------------------------------------------------------- */ intn H5AC_create(H5F_t *f, intn size_hint) { H5AC_t *cache = NULL; FUNC_ENTER(H5AC_create, FAIL); assert(f); assert(NULL == f->shared->cache); if (size_hint < 1) size_hint = H5AC_NSLOTS; if (NULL==(f->shared->cache = cache = H5MM_calloc(sizeof(H5AC_t)))) { HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed"); } cache->nslots = size_hint; cache->slot = H5MM_calloc(cache->nslots*sizeof(H5AC_slot_t)); if (NULL==cache->slot) { f->shared->cache = H5MM_xfree (f->shared->cache); HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed"); } FUNC_LEAVE(size_hint); } /*------------------------------------------------------------------------- * Function: H5AC_dest * * Purpose: Flushes all data to disk and destroys the cache. * This function fails if any object are protected since the * resulting file might not be consistent. * * Return: Non-negative on success/Negative on failure * * Programmer: Robb Matzke * matzke@llnl.gov * Jul 9 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5AC_dest(H5F_t *f) { H5AC_t *cache = NULL; FUNC_ENTER(H5AC_dest, FAIL); assert(f); assert(f->shared->cache); cache = f->shared->cache; if (H5AC_flush(f, NULL, NULL, TRUE) < 0) { HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush cache"); } #ifdef H5AC_DEBUG { uintn i; for (i=0; inslots; i++) { cache->slot[i].prot = H5MM_xfree(cache->slot[i].prot); cache->slot[i].aprots = 0; cache->slot[i].nprots = 0; } } #endif cache->slot = H5MM_xfree(cache->slot); cache->nslots = 0; f->shared->cache = cache = H5MM_xfree(cache); FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5AC_find_f * * Purpose: Given an object type and the address at which that object * is located in the file, return a pointer to the object. * The optional UDATA1 and UDATA2 structures are passed down to * the function that is responsible for loading the object into * memory. * * The returned pointer is guaranteed to be valid until the next * call to an H5AC function (if you want a pointer which is valid * indefinately then see H5AC_protect()). * * If H5AC_DEBUG is defined then this function also * checks that the requested object is not currently * protected since it is illegal to modify a protected object * except through the pointer returned by H5AC_protect(). * * Return: Success: Pointer to the object. The pointer is * valid until some other cache function * is called. * * Failure: NULL * * Programmer: Robb Matzke * matzke@llnl.gov * Jul 9 1997 * * Modifications: * * Robb Matzke, 4 Aug 1997 * Fails immediately if the cached object is at the correct address * but is of the wrong type. This happens if the caller doesn't know * what type of object is at the address and calls this function with * various type identifiers until one succeeds (cf., the debugger). * * Robb Matzke, 30 Oct 1997 * Keeps track of hits, misses, and flushes per object type so we have * some cache performance diagnostics. * *------------------------------------------------------------------------- */ void * H5AC_find_f(H5F_t *f, const H5AC_class_t *type, const haddr_t *addr, const void *udata1, void *udata2) { unsigned idx; herr_t status; void *thing = NULL; herr_t (*flush) (H5F_t *, hbool_t, const haddr_t *, void *) = NULL; H5AC_slot_t *slot = NULL; H5AC_t *cache = NULL; FUNC_ENTER(H5AC_find, NULL); assert(f); assert(f->shared->cache); assert(type); assert(type->load); assert(type->flush); assert(addr && H5F_addr_defined(addr)); idx = H5AC_HASH(f, addr); cache = f->shared->cache; slot = cache->slot + idx; /* * Return right away if the item is in the cache. */ if (slot->type == type && H5F_addr_eq(&(slot->addr), addr)) { cache->diagnostics[type->id].nhits++; HRETURN(slot->thing); } cache->diagnostics[type->id].nmisses++; /* * Fail if the item in the cache is at the correct address but is * of the wrong type. */ if (slot->type && slot->type != type && H5F_addr_eq(&(slot->addr), addr)) { HRETURN_ERROR(H5E_CACHE, H5E_BADTYPE, NULL, "internal error (correct address, wrong type)"); } #ifdef H5AC_DEBUG /* * Check that the requested thing isn't protected, for protected things * can only be modified through the pointer already handed out by the * H5AC_protect() function. */ { intn i; for (i = 0; i < slot->nprots; i++) { assert(H5F_addr_ne(addr, &(slot->prot[i].addr))); } } #endif /* * Load a new thing. If it can't be loaded, then return an error * without preempting anything. */ if (NULL == (thing = (type->load) (f, addr, udata1, udata2))) { HRETURN_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "unable to load object"); } /* * Free the previous cache entry if there is one. */ if (slot->type) { flush = slot->type->flush; status = (flush) (f, TRUE, &(slot->addr), slot->thing); if (status < 0) { /* * The old thing could not be removed from the stack. * Release the new thing and fail. */ if ((type->flush) (f, TRUE, addr, thing) < 0) { HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, NULL, "unable to flush just-loaded object"); } HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, NULL, "unable to flush existing cached object"); } cache->diagnostics[slot->type->id].nflushes++; } /* * Make the cache point to the new thing. */ slot->type = type; slot->addr = *addr; slot->thing = thing; FUNC_LEAVE(thing); } /*------------------------------------------------------------------------- * Function: H5AC_compare * * Purpose: Compare two hash entries by address. Unused entries are * all equal to one another and greater than all used entries. * * Return: Success: -1, 0, 1 * * Failure: never fails * * Programmer: Robb Matzke * matzke@llnl.gov * Aug 12 1997 * * Modifications: * *------------------------------------------------------------------------- */ #ifdef H5AC_SORT_BY_ADDR static int H5AC_compare(const void *_a, const void *_b) { intn a = *((const intn *) _a); intn b = *((const intn *) _b); assert(current_cache_g); if (NULL == current_cache_g->slot[a].type) { if (NULL == current_cache_g->slot[b].type) { return 0; } else { return -1; } } else if (NULL == current_cache_g->slot[b].type) { return 1; } else if (current_cache_g->slot[a].addr < current_cache_g->slot[b].addr) { return -1; } else if (current_cache_g->slot[a].addr > current_cache_g->slot[b].addr) { return 1; } return 0; } #endif /*------------------------------------------------------------------------- * Function: H5AC_flush * * Purpose: Flushes (and destroys if DESTROY is non-zero) the specified * entry from the cache. If the entry TYPE is CACHE_FREE and * ADDR is the null pointer then all types of entries are * flushed. If TYPE is CACHE_FREE and ADDR is non-null, then * whatever is cached at ADDR is flushed. Otherwise the thing * at ADDR is flushed if it is the correct type. * * If there are protected objects they will not be flushed. * However, an attempt will be made to flush all non-protected * items before this function returns failure. * * Return: Non-negative on success/Negative on failure if there was a * request to flush all items and something was protected. * * Programmer: Robb Matzke * matzke@llnl.gov * Jul 9 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5AC_flush(H5F_t *f, const H5AC_class_t *type, const haddr_t *addr, hbool_t destroy) { uintn i; herr_t status; herr_t (*flush) (H5F_t *, hbool_t, const haddr_t *, void *) = NULL; H5AC_slot_t *slot; intn *map = NULL; uintn nslots; H5AC_t *cache = NULL; FUNC_ENTER(H5AC_flush, FAIL); assert(f); assert(f->shared->cache); cache = f->shared->cache; if (!addr) { #ifdef H5AC_SORT_BY_ADDR /* * Sort the cache entries by address since flushing them in * ascending order by address may be much more efficient. */ if (NULL==(map=H5MM_malloc(cache->nslots * sizeof(intn)))) { HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed"); } for (i = nslots = 0; i < cache->nslots; i++) { if (cache->slot[i].type) map[nslots++] = i; } assert(NULL == current_cache_g); current_cache_g = cache; HDqsort(map, nslots, sizeof(intn), H5AC_compare); current_cache_g = NULL; #ifdef NDEBUG for (i = 1; i < nslots; i++) { assert(H5F_addr_lt(&(cache->slot[i - 1].addr), &(cache->slot[i].addr))); } #endif #else nslots = cache->nslots; #endif /* * Look at all cache entries. */ for (i = 0; i < nslots; i++) { #ifdef H5AC_SORT_BY_ADDR slot = cache->slot + map[i]; if (NULL == slot->type) break; /*the rest are empty */ #else slot = cache->slot + i; if (NULL == slot->type) continue; #endif if (!type || type == slot->type) { flush = slot->type->flush; status = (flush) (f, destroy, &(slot->addr), slot->thing); if (status < 0) { map = H5MM_xfree(map); HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush cache"); } cache->diagnostics[slot->type->id].nflushes++; if (destroy) slot->type = NULL; } } map = H5MM_xfree(map); /* * If there are protected object then fail. However, everything * else should have been flushed. */ if (cache->nprots > 0) { HRETURN_ERROR(H5E_CACHE, H5E_PROTECT, FAIL, "cache has protected items"); } } else { i = H5AC_HASH(f, addr); if ((!type || cache->slot[i].type == type) && H5F_addr_eq(&(cache->slot[i].addr), addr)) { /* * Flush just this entry. */ flush = cache->slot[i].type->flush; status = (flush) (f, destroy, &(cache->slot[i].addr), cache->slot[i].thing); if (status < 0) { HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush object"); } cache->diagnostics[cache->slot[i].type->id].nflushes++; if (destroy) cache->slot[i].type = NULL; } } FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5AC_set * * Purpose: Adds the specified thing to the cache. The thing need not * exist on disk yet, but it must have an address and disk * space reserved. * * If H5AC_DEBUG is defined then this function checks * that the object being inserted isn't a protected object. * * Return: Non-negative on success/Negative on failure * * Programmer: Robb Matzke * matzke@llnl.gov * Jul 9 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5AC_set(H5F_t *f, const H5AC_class_t *type, const haddr_t *addr, void *thing) { herr_t status; uintn idx; herr_t (*flush) (H5F_t *, hbool_t, const haddr_t *, void *) = NULL; H5AC_slot_t *slot = NULL; H5AC_t *cache = NULL; FUNC_ENTER(H5AC_set, FAIL); assert(f); assert(f->shared->cache); assert(type); assert(type->flush); assert(addr && H5F_addr_defined(addr)); assert(thing); idx = H5AC_HASH(f, addr); cache = f->shared->cache; slot = cache->slot + idx; #ifdef H5AC_DEBUG { intn i; for (i = 0; i < slot->nprots; i++) { assert(H5F_addr_ne(addr, &(slot->prot[i].addr))); } } #endif if (slot->type) { flush = slot->type->flush; status = (flush) (f, TRUE, &(slot->addr), slot->thing); if (status < 0) { HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush object"); } cache->diagnostics[slot->type->id].nflushes++; } slot->type = type; slot->addr = *addr; slot->thing = thing; cache->diagnostics[type->id].ninits++; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5AC_rename * * Purpose: Use this function to notify the cache that an object's * file address changed. * * If H5AC_DEBUG is defined then this function checks * that the old and new addresses don't correspond to the * address of a protected object. * * Return: Non-negative on success/Negative on failure * * Programmer: Robb Matzke * matzke@llnl.gov * Jul 9 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5AC_rename(H5F_t *f, const H5AC_class_t *type, const haddr_t *old_addr, const haddr_t *new_addr) { uintn old_idx, new_idx; herr_t (*flush) (H5F_t *, hbool_t, const haddr_t *, void *); herr_t status; H5AC_t *cache = NULL; FUNC_ENTER(H5AC_rename, FAIL); assert(f); assert(f->shared->cache); assert(type); assert(old_addr); assert(new_addr); old_idx = H5AC_HASH(f, old_addr); new_idx = H5AC_HASH(f, new_addr); cache = f->shared->cache; #ifdef H5AC_DEBUG { int i; for (i = 0; i < cache->slot[old_idx].nprots; i++) { assert(H5F_addr_ne(old_addr, &(cache->slot[old_idx].prot[i].addr))); } for (i = 0; i < cache->slot[new_idx].nprots; i++) { assert(H5F_addr_ne(new_addr, &(cache->slot[new_idx].prot[i].addr))); } } #endif /* * We don't need to do anything if the object isn't cached or if the * new hash value is the same as the old one. */ if (cache->slot[old_idx].type != type || H5F_addr_ne(&(cache->slot[old_idx].addr), old_addr)) { HRETURN(SUCCEED); } if (old_idx == new_idx) { cache->slot[old_idx].addr = *new_addr; HRETURN(SUCCEED); } /* * Free the item from the destination cache line. */ if (cache->slot[new_idx].type) { flush = cache->slot[new_idx].type->flush; status = (flush) (f, TRUE, &(cache->slot[new_idx].addr), cache->slot[new_idx].thing); if (status < 0) { HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush object"); } cache->diagnostics[cache->slot[new_idx].type->id].nflushes++; } /* * Move the source to the destination (it might not be cached) */ cache->slot[new_idx].type = cache->slot[old_idx].type; cache->slot[new_idx].addr = *new_addr; cache->slot[new_idx].thing = cache->slot[old_idx].thing; cache->slot[old_idx].type = NULL; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5AC_protect * * Purpose: Similar to H5AC_find() except the object is removed from * the cache and given to the caller, preventing other parts * of the program from modifying the protected object or * preempting it from the cache. * * The caller must call H5AC_unprotect() when finished with * the pointer. * * If H5AC_DEBUG is defined then we check that the * requested object isn't already protected. * * Return: Success: Ptr to the object. * * Failure: NULL * * Programmer: Robb Matzke * matzke@llnl.gov * Sep 2 1997 * * Modifications: * *------------------------------------------------------------------------- */ void * H5AC_protect(H5F_t *f, const H5AC_class_t *type, const haddr_t *addr, const void *udata1, void *udata2) { int idx; void *thing = NULL; H5AC_t *cache = NULL; H5AC_slot_t *slot = NULL; #ifdef H5AC_DEBUG static int ncalls = 0; if (0 == ncalls++) { if (H5DEBUG(AC)) { fprintf(H5DEBUG(AC), "H5AC: debugging cache (expensive)\n"); } else { fprintf(stderr, "H5AC: debugging cache (expensive)\n"); } } #endif FUNC_ENTER(H5AC_protect, NULL); /* check args */ assert(f); assert(f->shared->cache); assert(type); assert(type->load); assert(type->flush); assert(addr && H5F_addr_defined(addr)); idx = H5AC_HASH(f, addr); cache = f->shared->cache; slot = cache->slot + idx; if (slot->type == type && H5F_addr_eq(&(slot->addr), addr)) { /* * The object is already cached; simply remove it from the cache. */ cache->diagnostics[slot->type->id].nhits++; thing = slot->thing; slot->type = NULL; H5F_addr_undef(&(slot->addr)); slot->thing = NULL; } else if (slot->type && H5F_addr_eq(&(slot->addr), addr)) { /* * Right address but wrong object type. */ HRETURN_ERROR(H5E_CACHE, H5E_BADTYPE, NULL, "internal error"); } else { #ifdef H5AC_DEBUG /* * Check that the requested thing isn't protected, for protected things * can only be modified through the pointer already handed out by the * H5AC_protect() function. */ intn i; for (i = 0; i < slot->nprots; i++) { assert(H5F_addr_ne(addr, &(slot->prot[i].addr))); } #endif /* * Load a new thing. If it can't be loaded, then return an error * without preempting anything. */ cache->diagnostics[type->id].nmisses++; if (NULL == (thing = (type->load) (f, addr, udata1, udata2))) { HRETURN_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "unable to load object"); } } #ifdef H5AC_DEBUG /* * Add the protected object to the protect debugging fields of the * cache. */ if (slot->nprots >= slot->aprots) { size_t na = slot->aprots + 10; H5AC_prot_t *x = H5MM_realloc(slot->prot, na * sizeof(H5AC_prot_t)); if (NULL==x) { HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed"); } slot->aprots = (intn)na; slot->prot = x; } slot->prot[slot->nprots].type = type; slot->prot[slot->nprots].addr = *addr; slot->prot[slot->nprots].thing = thing; slot->nprots += 1; #endif cache->nprots += 1; FUNC_LEAVE(thing); } /*------------------------------------------------------------------------- * Function: H5AC_unprotect * * Purpose: This function should be called to undo the effect of * H5AC_protect(). The TYPE and ADDR arguments should be the * same as the corresponding call to H5AC_protect() and the * THING argument should be the value returned by H5AC_protect(). * * If H5AC_DEBUG is defined then this function fails * if the TYPE and ADDR arguments are not what was used when the * object was protected or if the object was never protected. * * Return: Non-negative on success/Negative on failure * * Programmer: Robb Matzke * matzke@llnl.gov * Sep 2 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5AC_unprotect(H5F_t *f, const H5AC_class_t *type, const haddr_t *addr, void *thing) { herr_t status; uintn idx; herr_t (*flush) (H5F_t *, hbool_t, const haddr_t *, void *) = NULL; H5AC_t *cache = NULL; H5AC_slot_t *slot = NULL; FUNC_ENTER(H5AC_unprotect, FAIL); /* check args */ assert(f); assert(f->shared->cache); assert(type); assert(type->flush); assert(addr && H5F_addr_defined(addr)); assert(thing); idx = H5AC_HASH(f, addr); cache = f->shared->cache; slot = cache->slot + idx; /* * Flush any object already in the cache at that location. It had * better not be another copy of the protected object. */ if (slot->type) { assert(H5F_addr_ne(&(slot->addr), addr)); flush = slot->type->flush; status = (flush) (f, TRUE, &(slot->addr), slot->thing); if (status < 0) { HRETURN_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush object"); } cache->diagnostics[slot->type->id].nflushes++; } #ifdef H5AC_DEBUG /* * Remove the object's protect data to indicate that it is no longer * protected. */ { int found, i; for (i = 0, found = FALSE; i < slot->nprots && !found; i++) { if (H5F_addr_eq(addr, &(slot->prot[i].addr))) { assert(slot->prot[i].type == type); HDmemmove(slot->prot + i, slot->prot + i + 1, ((slot->nprots - i) - 1) * sizeof(H5AC_prot_t)); slot->nprots -= 1; found = TRUE; } } assert(found); } #endif /* * Insert the object back into the cache; it is no longer protected. */ slot->type = type; slot->addr = *addr; slot->thing = thing; cache->nprots -= 1; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5AC_debug * * Purpose: Prints debugging info about the cache. * * Return: Non-negative on success/Negative on failure * * Programmer: Robb Matzke * Thursday, October 30, 1997 * * Modifications: * *------------------------------------------------------------------------- */ herr_t H5AC_debug(H5F_t UNUSED *f) { #ifdef H5AC_DEBUG H5AC_subid_t i; char s[32], ascii[32]; H5AC_t *cache = f->shared->cache; double miss_rate; #endif FUNC_ENTER(H5AC_debug, FAIL); #ifdef H5AC_DEBUG if (H5DEBUG(AC)) { fprintf(H5DEBUG(AC), "H5AC: meta data cache statistics for file %s\n", f->name); fprintf(H5DEBUG(AC), " %-18s %8s %8s %8s %8s+%-8s\n", "Layer", "Hits", "Misses", "MissRate", "Inits", "Flushes"); fprintf(H5DEBUG(AC), " %-18s %8s %8s %8s %8s-%-8s\n", "-----", "----", "------", "--------", "-----", "-------"); for (i = H5AC_BT_ID; i < H5AC_NTYPES; i++) { switch (i) { case H5AC_BT_ID: HDstrcpy(s, "B-tree nodes"); break; case H5AC_SNODE_ID: HDstrcpy(s, "symbol table nodes"); break; case H5AC_LHEAP_ID: HDstrcpy (s, "local heaps"); break; case H5AC_GHEAP_ID: HDstrcpy (s, "global heaps"); break; case H5AC_OHDR_ID: HDstrcpy(s, "object headers"); break; default: sprintf(s, "unknown id %d", i); } if (cache->diagnostics[i].nhits>0 || cache->diagnostics[i].nmisses>0) { miss_rate = 100.0 * cache->diagnostics[i].nmisses / (cache->diagnostics[i].nhits+ cache->diagnostics[i].nmisses); } else { miss_rate = 0.0; } if (miss_rate > 100) { sprintf(ascii, "%7d%%", (int) (miss_rate + 0.5)); } else { sprintf(ascii, "%7.2f%%", miss_rate); } fprintf(H5DEBUG(AC), " %-18s %8u %8u %7s %8u%+-9ld\n", s, cache->diagnostics[i].nhits, cache->diagnostics[i].nmisses, ascii, cache->diagnostics[i].ninits, ((long)(cache->diagnostics[i].nflushes) - (long)(cache->diagnostics[i].ninits))); } } #endif FUNC_LEAVE(SUCCEED); }