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<h1 class="post-title">Some of my previews experiment works: 2016</h1>
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<p class="post-meta">Oct 28, 2016</p>
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</header>
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<article class="post-content">
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<p>This blog contains only some basic record of my works. For some details, I will write a unique blog just for some specific topics.</p>
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<h1 id="2016-10">2016-10</h1>
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<h2 id="time-experiment-of-rsync">Time Experiment of rsync</h2>
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<p>Patch is based on rsync with version 3.1.2. [<a href="https://download.samba.org/pub/rsync/rsync-3.1.2.tar.gz">Rsync</a>|<a href="/static/2016-10/rsync/rsync-3.1.2-time.patch">Patch</a>]</p>
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<h3 id="how-to-collect-data">How to collect data</h3>
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<p>Basically, everything of transmission time and computation time will be output with overall time will be printed on the console.
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But we also need some bash script to collect data through different size of random size and with different modification through them.</p>
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<ul>
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<li>Start from 8K to 64M, modify at beginning, [<a href="/static/2016-10/rsync/small2Big_change_at_begin.sh">Bash script</a>]</li>
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<li>Start from 8K to 64M, modify at last, [<a href="/static/2016-10/rsync/small2Big_change_at_last.sh">Bash script</a>]</li>
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<li>Start from 8K to 64M, modify at random place with a (slow) python script, [<a href="/static/2016-10/rsync/small2Big_change_at_anyplace.sh">Bash script</a>|<a href="/static/2016-10/rsync/addbyte.py">Python program</a>]</li>
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</ul>
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<h2 id="time-experiment-of-seafile">Time Experiment of seafile</h2>
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<p>Patch is based on seafile 5.1.4. You can find the release from <a href="https://github.com/haiwen/seafile/releases">seafile official repo</a>. You may follow official compile instructions from <a href="https://manual.seafile.com/build_seafile/linux.html">here</a>. [<a href="">Patch <strong>no longer avaiable, new version at following sections</strong></a>]</p>
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<h3 id="how-to-collect-data-1">How to collect data</h3>
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<p>We also need everything be done using scripting. But this time I only design added some distance between two increasing files’ sizes.</p>
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<ul>
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<li>Start from 8K to 16M, 4 times increasing, modify at beginning/ at 1024 different places with python script. [<a href="/static/2016-11/seafile/trans.sh">Bash Script</a>|<a href="/static/2016-11/seafile/addbyte.py">Python program</a>]</li>
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<li>After using this auto testing script, everything of output will be marked in log files of seafile, which located in <strong>~/.ccnet/log/seafile.log</strong></li>
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<li>We need to use this simple awk code and vim operation to extract data.</li>
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</ul>
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<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="c"># CDC: content defined chucks</span>
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<span class="c"># HUT: Http upload traffic</span>
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<span class="c"># ALL: overall time of one commit & upload</span>
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awk <span class="s1">'/CDC|HUT|ALL/ {print $4,$5}'</span> ~/.ccnet/log/seafile.log > results.stat
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</code></pre>
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</div>
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<h3 id="install-seafile-on-odroid-xu">Install Seafile on odroid xu</h3>
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<p>Due to failure of my cross-compile to seafile on android. I used develop board as a replacement experiment platform for ARM-seafile testing. I used a <a href="http://www.hardkernel.com/main/products/prdt_info.php?g_code=G137510300620">odroid xu</a> as hardware standard. Because all I need is an ARM platform, only an ARM-Ubuntu is enough for me. But develop prototype on a board is much fun than coding, I won’t address much this time. But I’ll start a blog telling some really cool stuff I made for a strange aim.</p>
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<p>To install a ubuntu with GUI is my all preparation work. I found to way to do this.</p>
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<ul>
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<li>
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<p><a href="http://www.armhf.com/boards/odroid-xu/">armhf</a> is a website for arm-based ubuntu. It has a detailed instruction to follow at <a href="http://www.armhf.com/boards/odroid-xu/odroid-sd-install/">here</a>. They also provide ubuntu 12.04/ 14.04 and debian 7.5 to choose. But unfortunately odroid xu’s hdmi output doesn’t supported by ubuntu native firmware. So install ubuntu-desktop might can’t be boot up for video output.</p>
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</li>
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<li>
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<p>Burn images is much easy to install a pre-complied ubuntu system. I found this on odroid xu’s forum, which contains xubuntu image [<a href="http://odroid.in/ubuntu_14.04lts/ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img.xz">download</a>] for odroid xu. With this image, you just need to use dd command to write whole system mirror into sdcard.</p>
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</li>
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</ul>
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<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="c"># If .img end with xz, use this command to uncompress first</span>
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unxz ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img.xz
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<span class="c"># Burn image into SD-card</span>
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sudo dd <span class="k">if</span><span class="o">=</span>ubuntu-14.04lts-xubuntu-odroid-xu-20140714.img <span class="nv">of</span><span class="o">=</span>/dev/sdb <span class="nv">bs</span><span class="o">=</span>1M <span class="nv">conv</span><span class="o">=</span>fsync
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sync
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</code></pre>
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</div>
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<h1 id="2016-11">2016-11</h1>
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<h2 id="android-kernel">Android Kernel</h2>
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<h3 id="how-to-build-an-android-kernel">How to build an Android Kernel?</h3>
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<p>Generally, I won’t tell anything in this parts, just mark some related links, and point out some mistakes or error solutions.</p>
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<ul>
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<li>
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<p><a href="http://source.android.com/source/building-kernels.html#figuring-out-which-kernel-to-build">Google Official Guide</a>
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– If you don’t have AOSP sources, you have to download prebuilt toolchains which recommended in this guide might not be correct. Use following links to choose your fitting tools.
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— <a href="https://android.googlesource.com/?format=HTML">ASOP git root</a>, under sub class “/platform/prebuilts/gcc”</p>
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</li>
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<li>
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<p><a href="https://softwarebakery.com/building-the-android-kernel-on-linux">Packing and Flashing a Boot.img</a> <strong>[highly recommend]</strong></p>
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</li>
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</ul>
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<h1 id="2016-12">2016-12</h1>
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<h2 id="android-kernel-1">Android Kernel</h2>
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<h3 id="how-to-compile-with-ftrace">How to compile with ftrace?</h3>
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<p>If we want to debug under android, ftrace is a great tool for working. But, ftrace is not available in android if we used default configure file. Android kernel configuration is in <strong>arch/arm64/kernel/configs</strong>. We need to add few lines under that.</p>
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<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="nv">CONFIG_STRICT_MEMORY_RWX</span><span class="o">=</span>y
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<span class="nv">CONFIG_FUNCTION_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_FUNCTION_GRAPH_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_DYNAMIC_FTRACE</span><span class="o">=</span>y
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<span class="nv">CONFIG_PERSISTENT_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_IRQSOFF_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_PREEMPT_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_SCHED_TRACER</span><span class="o">=</span>y
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<span class="nv">CONFIG_STACK_TRACER</span><span class="o">=</span>y
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</code></pre>
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</div>
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<h3 id="how-to-extract-android-images-dump-an-image">How to extract android images: Dump an image</h3>
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<p>If we want to hold a rooted status after flashing boot, we need to extract an image from android devices. We can first use following command to find which blocks belongs to. According to some references, <a href="http://forum.xda-developers.com/showthread.php?t=2450045">this article</a> provide three ways to dump an image, I picked one for easy using.</p>
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<div class="language-bash highlighter-rouge"><pre class="highlight"><code>adb shell
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ls -al /dev/block/platform/<span class="nv">$SOME</span><span class="se">\_</span>DEVICE../../by-name <span class="c"># {Partitions} -> {Device Block}</span>
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<span class="c"># dump file</span>
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su
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dd <span class="k">if</span><span class="o">=</span>/dev/block/mmcblk0p37 <span class="nv">of</span><span class="o">=</span>/sdcard/boot.img
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</code></pre>
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</div>
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</article>
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</div>
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</div>
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<div class="col-second">
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<div class="col-box col-box-author">
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<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao - 碾子">
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<div class="col-box-title name">Pengzhan Hao - 碾子</div>
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<p></p>
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<p class="contact">
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<a href="https://github.com/codersherlock">GitHub</a>
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<a href="https://twitter.com/haopengzhan">Twitter</a>
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<a href="mailto:haopengzhan@gmail.com">Email</a>
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</p>
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</div>
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<div class="col-box">
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<div class="col-box-title">Newest Posts</div>
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<ul class="post-list">
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<li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
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<li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
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<li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
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<li><a class="post-link" href="/archivers/charles-is-not-a-good-tool">Using charles proxy to monitor mobile SSL traffics</a></li>
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<li><a class="post-link" href="/archivers/hello">Stop Talking is the worst title of one blog</a></li>
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</ul>
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