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redis-cli --latency-dist now uses a color palette.

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Still not happy with the result but low grays are hard to see in certain
monitors with a non perfect gamma.
This commit is contained in:
antirez 2015-02-07 20:15:40 +01:00
parent ace1acc532
commit 2723412b7b
1 changed files with 14 additions and 8 deletions
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20
src/redis-cli.c
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@ -1122,6 +1122,15 @@ static void latencyMode(void) {
#define LATENCY_DIST_MAX_GRAY 255 #define LATENCY_DIST_MAX_GRAY 255
#define LATENCY_DIST_GRAYS (LATENCY_DIST_MAX_GRAY-LATENCY_DIST_MIN_GRAY+1) #define LATENCY_DIST_GRAYS (LATENCY_DIST_MAX_GRAY-LATENCY_DIST_MIN_GRAY+1)
/* Gray palette. Currently not used.
* int spectrum_palette_size = 24;
* int spectrum_palette[] = {0, 233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255};
*/
/* Color palette from https://github.com/draios/sysdig */
int spectrum_palette[] = {0, 22, 28, 64, 34, 2, 76, 46, 118, 154, 191, 227, 226, 11, 220, 209, 208, 202, 197, 9, 1};
int spectrum_palette_size = 21;
/* Structure to store samples distribution. */ /* Structure to store samples distribution. */
struct distsamples { struct distsamples {
long long max; /* Max latency to fit into this interval (usec). */ long long max; /* Max latency to fit into this interval (usec). */
@ -1143,20 +1152,17 @@ struct distsamples {
void showLatencyDistSamples(struct distsamples *samples, long long tot) { void showLatencyDistSamples(struct distsamples *samples, long long tot) {
int j; int j;
/* We convert samples into a number between 0 and DIST_GRAYS, /* We convert samples into a index inside the palette
* proportional to the percentage a given bucket represents. * proportional to the percentage a given bucket represents.
* This way intensity of the different parts of the spectrum * This way intensity of the different parts of the spectrum
* don't change relative to the number of requests, which avoids to * don't change relative to the number of requests, which avoids to
* pollute the visualization with non-latency related info. */ * pollute the visualization with non-latency related info. */
printf("\033[38;5;0m"); /* Set foreground color to black. */ printf("\033[38;5;0m"); /* Set foreground color to black. */
for (j = 0; ; j++) { for (j = 0; ; j++) {
float color = (float) samples[j].count / tot * LATENCY_DIST_GRAYS; int coloridx =
color = ceil(color) + (LATENCY_DIST_MIN_GRAY-1); ceil((float) samples[j].count / tot * (spectrum_palette_size-1));
if (color == LATENCY_DIST_MIN_GRAY-1) { int color = spectrum_palette[coloridx];
printf("\033[48;5;0m ");
} else {
printf("\033[48;5;%dm%c", (int)color, samples[j].character); printf("\033[48;5;%dm%c", (int)color, samples[j].character);
}
samples[j].count = 0; samples[j].count = 0;
if (samples[j].max == 0) break; /* Last sample. */ if (samples[j].max == 0) break; /* Last sample. */
} }