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save lotsa memory

This commit is contained in:
tromp 2016-10-18 22:07:54 -04:00
parent 2fed4d202f
commit 1cf76fa976
1 changed files with 14 additions and 2 deletions
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16
equi_miner.h
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@ -41,16 +41,28 @@ typedef u32 au32;
// 2_log of number of buckets
#define BUCKBITS (DIGITBITS-RESTBITS)
#ifndef SAVEMEM
#if RESTBITS == 4
// can't save memory in such small buckets
#define SAVEMEM 1
#elif RESTBITS >= 8
// take advantage of law of large numbers (sum of 2^8 random numbers)
// this reduces (200,9) memory to under 144MB, with negligible discarding
#define SAVEMEM 9/14
#endif
#endif
// number of buckets
static const u32 NBUCKETS = 1<<BUCKBITS;
// 2_log of number of slots per bucket
static const u32 SLOTBITS = RESTBITS+1+1;
static const u32 SLOTRANGE = 1<<SLOTBITS;
// number of slots per bucket
static const u32 NSLOTS = 1<<SLOTBITS;
static const u32 NSLOTS = SLOTRANGE * SAVEMEM;
// number of per-xhash slots
static const u32 XFULL = 16;
// SLOTBITS mask
static const u32 SLOTMASK = NSLOTS-1;
static const u32 SLOTMASK = SLOTRANGE-1;
// number of possible values of xhash (rest of n) bits
static const u32 NRESTS = 1<<RESTBITS;
// number of blocks of hashes extracted from single 512 bit blake2b output