From bfc5ce4bc01e5eb28969eefcc01ecfefa2601fdf Mon Sep 17 00:00:00 2001 From: johannst Date: Wed, 31 Jan 2024 22:52:33 +0000 Subject: deploy: f3e631f7539c71686d1e336756c9c0fcd0b587ad --- tools/awk.html | 2 +- tools/bash.html | 2 +- tools/column.html | 2 +- tools/dot.html | 2 +- tools/emacs.html | 2 +- tools/ffmpeg.html | 2 +- tools/fish.html | 2 +- tools/gdb.html | 2 +- tools/gdbserver.html | 2 +- tools/git.html | 2 +- tools/gnuplot.html | 306 +++++++++++++++++++++++++++++++++++++++++++++ tools/gnuplot/mem_lat.c | 67 ++++++++++ tools/gnuplot/mem_lat.plot | 13 ++ tools/gnuplot/plot.sh | 11 ++ tools/gpg.html | 2 +- tools/index.html | 3 +- tools/pacman.html | 2 +- tools/qemu.html | 2 +- tools/radare2.html | 2 +- tools/sed.html | 6 +- tools/sort.html | 2 +- tools/tmux.html | 2 +- tools/zsh.html | 2 +- 23 files changed, 419 insertions(+), 21 deletions(-) create mode 100644 tools/gnuplot.html create mode 100644 tools/gnuplot/mem_lat.c create mode 100644 tools/gnuplot/mem_lat.plot create mode 100644 tools/gnuplot/plot.sh (limited to 'tools') diff --git a/tools/awk.html b/tools/awk.html index ead314e..9d301da 100644 --- a/tools/awk.html +++ b/tools/awk.html @@ -88,7 +88,7 @@

diff --git a/tools/bash.html b/tools/bash.html index faabfa6..580e941 100644 --- a/tools/bash.html +++ b/tools/bash.html @@ -88,7 +88,7 @@

diff --git a/tools/column.html b/tools/column.html index 69dba96..b98a279 100644 --- a/tools/column.html +++ b/tools/column.html @@ -88,7 +88,7 @@

diff --git a/tools/dot.html b/tools/dot.html index cb9fd32..5e45abd 100644 --- a/tools/dot.html +++ b/tools/dot.html @@ -88,7 +88,7 @@

diff --git a/tools/emacs.html b/tools/emacs.html index b7626a3..8185ae9 100644 --- a/tools/emacs.html +++ b/tools/emacs.html @@ -88,7 +88,7 @@

diff --git a/tools/ffmpeg.html b/tools/ffmpeg.html index cf7b323..3c8a3f1 100644 --- a/tools/ffmpeg.html +++ b/tools/ffmpeg.html @@ -88,7 +88,7 @@

diff --git a/tools/fish.html b/tools/fish.html index 06642fd..34faca9 100644 --- a/tools/fish.html +++ b/tools/fish.html @@ -88,7 +88,7 @@

diff --git a/tools/gdb.html b/tools/gdb.html index 90c451e..4a0dcea 100644 --- a/tools/gdb.html +++ b/tools/gdb.html @@ -88,7 +88,7 @@

diff --git a/tools/gdbserver.html b/tools/gdbserver.html index ed50b9a..48d5bd7 100644 --- a/tools/gdbserver.html +++ b/tools/gdbserver.html @@ -88,7 +88,7 @@

diff --git a/tools/git.html b/tools/git.html index 8782baf..fe62b83 100644 --- a/tools/git.html +++ b/tools/git.html @@ -88,7 +88,7 @@

diff --git a/tools/gnuplot.html b/tools/gnuplot.html new file mode 100644 index 0000000..a794455 --- /dev/null +++ b/tools/gnuplot.html @@ -0,0 +1,306 @@ + + + + + + gnuplot - Notes + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

+ + + + + + + + + + + + + + + + + + + +

+ +

+ + + + +

+ + + +

+ + + + + + + +

+ + + + + + +

gnuplot (1)

# Launch interactive shell.
+gnuplot
+
+# Launch interactive shell.
+gnuplot [opt]
+  opt:
+    -p ................ persist plot window
+    -c <file> ......... run script file
+    -e "<cmd1>; .." ... run cmd(s)
+

Frequently used configuration

# Plot title.
+set title "the plot"
+
+# Labels.
+set xlabel "abc"
+set ylabel "def"
+
+# Output format, 'help set term' for all output formats.
+set term svg
+# Output file.
+set output "out.svg"
+
+# Make axis logarithmic to given base.
+set logscale x 2
+
+# Change separator, default is whitespace.
+set datafile separator ","
+

Plot

# With specific style (eg lines, linespoint, boxes, steps, impulses, ..).
+plot "<data_file>" with <plot_style>
+
+> cat data.txt
+1 1 3
+2 2 2
+3 3 1
+4 2 2
+
+# Plot specific column.
+plot "data.txt" using 1:2, "data.txt" using 1:3
+# Equivalent using the special file "", which re-uses the previous input file.
+plot "data.txt" using 1:2, "" using 1:3
+
+# Plot piped data.
+plot "< head -n2 data.txt"
+
+# Plot with alternate title.
+plot "data.txt" title "moose"
+

Example: multiple data sets in on plot

# file: mem_lat.plot
+
+set title  "memory latency (different strides)"
+set xlabel "array in KB"
+set ylabel "cycles / access"
+
+set logscale x 2
+
+plot "stride_32.txt"  title "32"  with linespoints, \
+     "stride_64.txt"  title "64"  with linespoints, \
+     "stride_128.txt" title "128" with linespoints, \
+     "stride_256.txt" title "256" with linespoints, \
+     "stride_512.txt" title "512" with linespoints
+

On Linux x86_64, mem_lat.c provides an example which can +be run as follows.

gcc -o mem_lat mem_lat.c -g -O3 -Wall -Werror
+
+for stride in 32 64 128 256 512; do \
+    taskset -c 1 ./mem_lat 128 $stride | tee stride_$stride.txt ; \
+done
+
+gnuplot -p -c mem_lat.plot
+

+ +

+ + +

+ + + +

+ + + + + + + + + + + + + + + + + + +

+ + diff --git a/tools/gnuplot/mem_lat.c b/tools/gnuplot/mem_lat.c new file mode 100644 index 0000000..b85a08f --- /dev/null +++ b/tools/gnuplot/mem_lat.c @@ -0,0 +1,67 @@ +#include +#include +#include +#include +#include + +enum : size_t { + KB = 1024, + MB = 1024 * KB, + + DFL_MAXSZ = 64 * MB, + DFL_STRIDE = 256, + NUM_ACCESS = 1ull << 24, +}; + +static inline uint64_t rdtsc() { + uint32_t eax, edx; + asm volatile("rdtsc" : "=a"(eax), "=d"(edx)); + return ((uint64_t)edx << 32) | eax; +} + +uint64_t run_one_walk(size_t size, size_t stride) { + // Check size is power of two. + assert((size & (size -1)) == 0); + assert((size / stride) <= NUM_ACCESS); + + unsigned char *mem = (unsigned char *)malloc(size); + memset(mem, 0x55, size); + + const uint64_t start = rdtsc(); + for (size_t it = 0; it < NUM_ACCESS; it++) { + ((volatile unsigned char *)mem)[(it * stride) & (size - 1)]++; + } + const uint64_t stop = rdtsc(); + + free(mem); + return stop - start; +} + +int main(int argc, char *argv[]) { + size_t max_sz = DFL_MAXSZ; + size_t stride = DFL_STRIDE; + + if (argc > 1) { + max_sz = strtoll(argv[1], 0, 10); + max_sz *= MB; + } + if (argc > 2) { + stride = strtoll(argv[2], 0, 10); + } + + fprintf(stderr, "max_sz=%zuK stride=%zu access=%zu\n", + max_sz / KB, stride, NUM_ACCESS); + + size_t size = 2048; + while (size <= max_sz) { + uint64_t cycles = 0; + for (size_t loop = 0; loop < 10; ++loop) { + cycles += run_one_walk(size, stride); + } + printf("%6zuK %f\n", size / KB, (double)cycles / NUM_ACCESS / 10.0); + + size *= 2; + } + + return 0; +} diff --git a/tools/gnuplot/mem_lat.plot b/tools/gnuplot/mem_lat.plot new file mode 100644 index 0000000..db058f9 --- /dev/null +++ b/tools/gnuplot/mem_lat.plot @@ -0,0 +1,13 @@ +# file: mem_lat.plot + +set title "memory latency (different strides)" +set xlabel "array in KB" +set ylabel "cycles / access" + +set logscale x 2 + +plot "stride_32.txt" title "32" with linespoints, \ + "stride_64.txt" title "64" with linespoints, \ + "stride_128.txt" title "128" with linespoints, \ + "stride_256.txt" title "256" with linespoints, \ + "stride_512.txt" title "512" with linespoints diff --git a/tools/gnuplot/plot.sh b/tools/gnuplot/plot.sh new file mode 100644 index 0000000..e288c6c --- /dev/null +++ b/tools/gnuplot/plot.sh @@ -0,0 +1,11 @@ +#!/bin/bash + +gcc -o mem_lat mem_lat.c -g -O3 -Wall -Werror + +for stride in 32 64 128 256 512; do \ + taskset -c 1 ./mem_lat 128 $stride | tee stride_$stride.txt ; \ +done + +gnuplot -p -c mem_lat.plot + +rm -f stride_*.txt mem_lat diff --git a/tools/gpg.html b/tools/gpg.html index d4caad5..acdf8f9 100644 --- a/tools/gpg.html +++ b/tools/gpg.html @@ -88,7 +88,7 @@