pcarrier

/*
 * % gcc -O3 -std=c99 -o sum sum.c; ./sum
 * sum:142913828922,count:148933,cpu:0.00
 */

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

pcarrier

% java -cp target/classes PrimeSum 1000   
There are 168 primes <= to 1,000.
Their sum is 76,127.
Their product is 19,590,340,644,999,083,431,262,508,198,206,381,046,123,972,390,589,368,223,882,605,328,968,666,316,379,870,661,851,951,648,789,482,321,596,229,559,115,436,019,149,189,529,725,215,266,728,292,282,990,852,649,023,362,731,392,404,017,939,142,010,958,261,393,634,959,471,483,757,196,721,672,243,410,067,118,516,227,661,133,135,192,488,848,989,914,892,157,188,308,679,896,875,137,439,519,338,903,968,094,905,549,750,386,407,106,033,836,586,660,683,539,201,011,635,917,900,039,904,495,065,203,299,749,542,985,993,134,669,814,805,318,474,080,581,207,891,125,910.
Computed in 0.003sec.

pcarrier

#!/usr/bin/env ruby
BLOCK_PATH='/sys/block'
MIB = 1024*1024
Dir.entries(BLOCK_PATH).select{|e| e.start_with? 'zram'}.each {|dev|
  orig = File.read(File.join BLOCK_PATH, dev, 'orig_data_size').to_i
  compr = File.read(File.join BLOCK_PATH, dev, 'compr_data_size').to_i
  printf "%s: %6.2f%% (%.2f MiB -> %.2f MiB)\n", dev, 100*compr/orig, orig/MIB, compr/MIB
}

pcarrier

Assembly:             0.000169164 *  10000 =     1.691642309
C (diet, static):     0.000178204 *   5000 =     0.891020651
C (musl, static):     0.000194115 *   5000 =     0.970577889
C (musl, dynamic):    0.000342195 *   5000 =     1.710977786
C (static):           0.000090583 *   5000 =     0.452919855
C (dynamic):          0.000702688 *   3000 =     2.108064792
Fortran (static):     0.000455501 *   5000 =     2.277508594
Fortran (dynamic):    0.001639982 *   2000 =     3.279964656
Haskell (static):     0.001355104 *   2000 =     2.710208459
Haskell (dynamic):    0.002697174 *   1000 =     2.697174090

pcarrier

% <hello.clj; time java -jar /usr/share/clojure/clojure.jar hello.clj; time java -XX:+TieredCompilation -Xbootclasspath/a:/usr/share/clojure/clojure.jar clojure.main hello.clj; time java -jar /usr/share/clojure/clojure.jar hello.clj; time java -XX:+TieredCompilation -Xbootclasspath/a:/usr/share/clojure/clojure.jar clojure.main hello.clj
(println "hello world")
hello world
java -jar /usr/share/clojure/clojure.jar hello.clj  1.17s user 0.22s system 134% cpu 1.038 total
hello world
java -XX:+TieredCompilation -Xbootclasspath/a:/usr/share/clojure/clojure.jar   0.72s user 0.03s system 178% cpu 0.420 total
hello world
java -jar /usr/share/clojure/clojure.jar hello.clj  1.14s user 0.21s system 132% cpu 1.012 total
hello world
java -XX:+TieredCompilation -Xbootclasspath/a:/usr/share/clojure/clojure.jar   0.68s user 0.04s system 180% cpu 0.395 total

pcarrier

     0.000000 execve("./noop_go", ["./noop_go"], [/* 66 vars */]) = 0
     0.000945 arch_prctl(ARCH_SET_FS, 0x427428) = 0
     0.000254 open("/proc/stat", O_RDONLY|O_CLOEXEC) = 3
     0.000340 read(3, "cpu  10578637 859618 3023222 179"..., 252) = 252
     0.000247 read(3, "522313 45769723 42392 0 747 0 0 "..., 252) = 252
     0.000161 read(3, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
     0.000138 read(3, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
     0.000117 read(3, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
     0.000115 read(3, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
     0.000153 read(3, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252

pcarrier

$ CC=clang ./configure; make 2>&1 | head -n100
checking for C compiler... clang
checking whether compiler is gcc... no
checking target system type... x86_64-unknown-linux-gnu
checking whether compiler accepts -std=c99... yes
checking whether compiler accepts -nostdinc... yes
checking whether compiler accepts -ffreestanding... yes
checking whether compiler accepts -fexcess-precision=standard... yes
checking whether compiler accepts -frounding-math... yes
checking whether compiler accepts -Os... yes

pcarrier

% ls -lh ./build/darwin-x86_64*/avian 
5473595 -rwxr-xr-x  1 pierre  staff    67M Nov 13 00:39 ./build/darwin-x86_64-openjdk-src/avian*
4876755 -rwxr-xr-x  1 pierre  staff   1.2M Nov 11 06:01 ./build/darwin-x86_64/avian*
% for j in build/darwin-x86_64*/avian java; time $j -cp $HOME Hello
Hello
$j -cp $HOME Hello  0.10s user 0.01s system 96% cpu 0.122 total
Hello
$j -cp $HOME Hello  0.01s user 0.00s system 87% cpu 0.008 total
Hello
$j -cp $HOME Hello  0.09s user 0.02s system 100% cpu 0.109 total

pcarrier

Trying to be "idiomatic" yet fair. Used JD GUI to show the bytecode in human-readable Java.

Somehow mirah breaks JD GUI, which is probably interesting.
So I went through an intermediate Java file thanks to mirah -j instead.

pcarrier

Q: Does this Linux ISO support booting off a USB pendrive on a Mac EFI?
(I don't want no BIOS jail, that shit drove me insane about 8 hours ago and I'm out of coffee now)

A: Simple! Yes if it starts with ER. No if it doesn't start with ER.

Examples:
% (dd bs=8 count=1 2>/dev/null|xxd) < Fedora-17-x86_64-Live-Desktop.iso
0000000: 4552 0800 0000 9090                      ER......
===> That's a yes.