leventov’s gists

leventov / bios.s

Created December 13, 2011 21:56

lab4: protected mode with paging

	.arch pentium4
	.code16
	.section .text

	.org 0x100

	_gdt: .quad 0
	.byte 0xFF, 0xFF, 0, 0, 0xF, 0b10011010, 0b00001111, 0 # код
	.byte 0xFF, 0xFF, 0, 0, 0xF, 0b10010000, 0b00001111, 0 # данные
	.byte 0x00, 0x80, 0,0x80, 0xB, 0b10010010, 0b00000000, 0 # видео

leventov / minmax.c

Last active December 10, 2015 18:48

	-- minmax.h
	float max_ss(float a, float b);
	float min_ss(float a, float b);

	double max_sd(double a, double b);
	double min_sd(double a, double b);

	float clamp_ss(float x, float mn, float mx);
	double clamp_sd(double x, double mn, double mx);

leventov / blur-core.hs

Last active December 12, 2015 06:38

blur.hs: inlining issue. Search `$wa2` in blur-core.hs to see details. See http://stackoverflow.com/questions/14748900/ghc-doesnt-perform-2-stage-partial-application-inlining

	[1 of 1] Compiling Main ( blur.hs, blur.o )

	==================== Simplified expression ====================
	quoteExp
	dim2St
	(unpackCString#
	" 2 4 5 4 2\
	\ 4 9 12 9 4\
	\ 5 12 15 12 5\
	\ 4 9 12 9 4\

leventov / compile

Last active December 15, 2015 08:29

http://stackoverflow.com/questions/15595140/repa-zipwithing-over-columns

$ ghc -Odph -rtsopts -threaded -fno-liberate-case -funbox-strict-fields -funfolding-keeness-factor1000 -fllvm -optlo-O3 -fexpose-all-unfoldings -fsimpl-tick-factor=500 -ddump-simpl -dsuppress-all zip-columns.hs > z.hs

leventov / BoundedSetContains.java

Created September 29, 2013 05:49

BoundedSetContains -- http://stackoverflow.com/questions/19073006/what-is-an-efficient-way-to-get-values-that-are-not-included-in-various-arrays

	package tests;

	import org.openjdk.jmh.annotations.*;

	import java.util.*;
	import java.util.concurrent.ThreadLocalRandom;
	import java.util.concurrent.TimeUnit;

	@BenchmarkMode(Mode.AverageTime)
	@Measurement(time = 100, timeUnit = TimeUnit.MILLISECONDS)

leventov / memory.txt

Created July 21, 2014 20:00

Results of "time vs memory" benchmark: https://github.com/OpenHFT/hftc/tree/25511ccb8dd1afd0c11cc2233f24bdd98ffdb108/benchmarks/time-vs-memory. Information about the runsite: Intel Sandy Bridge (2011), L1: 64 KB, L2: 256 KB, L3: 20 MB, 128 GB of RAM. Java8u5.

	loadLevel collections overuseFactor
	1 hftc 7.226
	1 hftc 10.791
	1 hftc 7.470
	1 hftc 11.172
	1 hftc 7.748
	1 hftc 11.576
	1 hftc 8.039
	1 hftc 11.993
	1 hftc 8.339

leventov / analyze.py

Created September 4, 2014 23:53

См. http://habrahabr.ru/post/235689/. Инструкция по применению в первом комментарии

	import json

	MIN_STARS = 700

	with open('{}.json'.format(MIN_STARS)) as json_file:
	repos = json.load(json_file)

	repos_by_language = {}
	by_top = {}
	for repo in repos:

leventov / AdvancedIntStatistics.java

Created May 24, 2015 15:02

Java source stats. See http://habrahabr.ru/post/258641/

	package spoon.test;

	import spoon.reflect.declaration.*;

	import java.util.ArrayList;
	import java.util.IntSummaryStatistics;
	import java.util.TreeSet;
	import java.util.function.Consumer;
	import java.util.function.ToIntFunction;

leventov / Hashing.java

Last active August 29, 2015 14:25

Zero-allocation-hashing benchmarks

	package tests;

	import com.google.common.hash.HashFunction;
	import net.openhft.chronicle.hash.hashing.Accesses;
	import net.openhft.chronicle.hash.hashing.Hasher;
	import net.openhft.hashing.LongHashFunction;
	import org.openjdk.jmh.annotations.*;

	import java.util.concurrent.TimeUnit;

leventov / SmoothieMapBenchmark.java

Created September 8, 2015 10:35

	package tests;

	import java.util.*;
	import java.util.Map.Entry;
	import java.util.concurrent.TimeUnit;

	import org.openjdk.jmh.annotations.Benchmark;
	import org.openjdk.jmh.annotations.BenchmarkMode;
	import org.openjdk.jmh.annotations.Fork;
	import org.openjdk.jmh.annotations.Measurement;

Roman Leventov leventov