tobert

#!/usr/local/bin/perl

use warnings;
use strict;
use Config::ApacheFormat;
use Getopt::Long;
use File::Path;
use File::Basename;
use Net::SSH::Perl;
use Data::Dumper; # for debugging

tobert

#!/bin/bash

# put this in /etc/dnsmasq.conf then start/restart it
# modify the interface= to point at the ethernet port the device is connected to
# optionally, set MAC address in the dhcp-host line to be the MAC of the device
#interface=enp0s31f6
#dhcp-range=192.168.102.9,192.168.102.20,255.255.255.0,12h
#dhcp-host=70:58:12:a8:e5:35,192.168.102.10

# set INTERNET_INTERFACE to the laptop's internet access interface, e.g. wifi interfaces

tobert

##########
# Win10 Initial Setup Script
# Author: Disassembler <[email protected]>
# Version: 1.7, 2016-08-15

# dasm's script: https://github.com/Disassembler0/Win10-Initial-Setup-Script/

# THIS IS A PERSONALIZED VERSION
# This script leaves more MS defaults on, including MS security features.
# Tweaked based on personal preferences for @alirobe 2016-11-16 - v1.7.1

tobert

package hal

import (
        "regexp"
        "time"

        "github.com/netflix/hal-9001/hal"
)

/* hal.Cmd, hal.Param, hal.CmdInst, and hal.ParamInst are handles for hal's

tobert

Keybase proof

I hereby claim:

• I am tobert on github.
• I am tobert (https://keybase.io/tobert) on keybase.
• I have a public key whose fingerprint is AF40 7321 06AA 750B 287F 5265 A241 73D6 A6B8 5735

To claim this, I am signing this object:

tobert

gadget xen # xl create -c /etc/xen/archlinux.cfg
Parsing config from /etc/xen/archlinux.cfg
libxl: warning: libxl_dm.c:350:libxl__domain_device_construct_rdm: Ignoring RDM conflict at 0x7c4bf000.

libxl: error: libxl_device.c:952:device_backend_callback: unable to add device with path /local/domain/0/backend/vbd/12/51712
libxl: error: libxl_create.c:1174:domcreate_launch_dm: unable to add disk devices
libxl: error: libxl_dm.c:2004:libxl__destroy_device_model: xs_rm failed for /local/domain/0/device-model/12
libxl: error: libxl_dm.c:1956:kill_device_model: unable to find device model pid in /local/domain/12/image/device-model-pid
libxl: error: libxl.c:1628:libxl__destroy_domid: libxl__destroy_device_model failed for 12
libxl: error: libxl_device.c:952:device_backend_callback: unable to remove device with path /local/domain/0/backend/vbd/12/51712

tobert

# enable assertions.  disabling this in production will give a modest
# performance benefit (around 5%).
JVM_OPTS="$JVM_OPTS -ea"

# min and max heap sizes should be set to the same value to avoid
# stop-the-world GC pauses during resize, and so that we can lock the
# heap in memory on startup to prevent any of it from being swapped
# out.
JVM_OPTS="$JVM_OPTS -Xms${MAX_HEAP_SIZE}"
JVM_OPTS="$JVM_OPTS -Xmx${MAX_HEAP_SIZE}"

tobert

Results:
op rate                   : 1981 [simple:1981]
partition rate            : 1981 [simple:1981]
row rate                  : 1981 [simple:1981]
latency mean              : 64.6 [simple:64.6]
latency median            : 40.4 [simple:40.4]
latency 95th percentile   : 150.0 [simple:150.0]
latency 99th percentile   : 185.3 [simple:185.3]
latency 99.9th percentile : 308.0 [simple:308.0]
latency max               : 633.2 [simple:633.2]

tobert

diff --git a/src/java/org/apache/cassandra/io/util/RandomAccessReader.java b/src/java/org/apache/cassandra/io/util/RandomAccessReader.java
index 95877a2..47b4b9b 100644
--- a/src/java/org/apache/cassandra/io/util/RandomAccessReader.java
+++ b/src/java/org/apache/cassandra/io/util/RandomAccessReader.java
@@ -31,6 +31,7 @@ public class RandomAccessReader extends RandomAccessFile implements FileDataInpu

     // default buffer size, 64Kb
     public static final int DEFAULT_BUFFER_SIZE = 65536;
+    public static final int BUFFER_SIZE = getBufferSize();

tobert

Results:
op rate                   : 7741 [READ:7741]
partition rate            : 7741 [READ:7741]
row rate                  : 7741 [READ:7741]
latency mean              : 103.3 [READ:103.3]
latency median            : 79.6 [READ:79.6]
latency 95th percentile   : 217.7 [READ:217.7]
latency 99th percentile   : 347.9 [READ:347.9]
latency 99.9th percentile : 515.7 [READ:515.7]
latency max               : 977.7 [READ:977.7]