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started using decrease cooldown so that compression level would not decrease several times in a row

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This commit is contained in:
Paul Cruz 2017-07-25 11:16:27 -07:00
parent 85d7c919f6
commit e02c79f833
1 changed files with 9 additions and 2 deletions
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11
contrib/adaptive-compression/adapt.c
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@ -26,7 +26,8 @@
#define DEFAULT_COMPRESSION_LEVEL 6
#define DEFAULT_ADAPT_PARAM 0
#define MAX_COMPRESSION_LEVEL_CHANGE 2
#define CONVERGENCE_LOWER_BOUND 3
#define CONVERGENCE_LOWER_BOUND 5
#define CLEVEL_DECREASE_COOLDOWN 5
static int g_displayLevel = DEFAULT_DISPLAY_LEVEL;
static unsigned g_compressionLevel = DEFAULT_COMPRESSION_LEVEL;
@ -79,6 +80,7 @@ typedef struct {
unsigned allJobsCompleted;
unsigned adaptParam;
unsigned convergenceCounter;
unsigned cooldown;
double createWaitCompressionCompletion;
double compressWaitCreateCompletion;
double compressWaitWriteCompletion;
@ -216,6 +218,7 @@ static int initCCtx(adaptCCtx* ctx, unsigned numJobs)
ctx->writeCompletion = 1;
ctx->compressionCompletion = 1;
ctx->convergenceCounter = 0;
ctx->cooldown = 0;
ctx->jobs = calloc(1, numJobs*sizeof(jobDescription));
@ -365,8 +368,11 @@ static void adaptCompressionLevel(adaptCCtx* ctx)
ctx->compressWaitCreateCompletion = 1;
pthread_mutex_unlock(&ctx->createCompletion_mutex.pMutex);
DEBUG(2, "convergence counter: %u\n", ctx->convergenceCounter);
/* adaptation logic */
if (1-createWaitCompressionCompletion > threshold || 1-writeWaitCompressionCompletion > threshold) {
if (ctx->cooldown) ctx->cooldown--;
if ((1-createWaitCompressionCompletion > threshold || 1-writeWaitCompressionCompletion > threshold) && ctx->cooldown == 0) {
/* create or write waiting on compression */
/* use whichever one waited less because it was slower */
double const completion = MAX(createWaitCompressionCompletion, writeWaitCompressionCompletion);
@ -378,6 +384,7 @@ static void adaptCompressionLevel(adaptCCtx* ctx)
}
else if (boundChange != 0) {
ctx->compressionLevel -= boundChange;
ctx->cooldown = CLEVEL_DECREASE_COOLDOWN;
ctx->convergenceCounter = 1;
}