Lab2

The first project I built for this exercise is bazaar  on an Aarch64 system, the build presses was fairly simple, first step was to make sure I had the correct version of python, I checked that I had the correct version of python installed in this case the system already had the required version so I did not have to do anything. I then located the build directory and ran the setup.py file included to build the software. This package was very quick and easy as it wass small and did not have many build dependencies.


The next package I built for the exercise is glibc the one of the most notable differences to the previous package is that,It has a directory for the build and also one for the source code this make it easy to clean things out and rebuild if needed and just keeps things more organized.

the first thing I did was git clone the directory, then I made a new directory for the build, I had no issues running the initial configure and makes commands witch built the library without installing it. however when attempting to install it to a specific directory ran into the following error

cannot remove '/usr/lib64/libc.a': Permission denied

now I could simply sudo to overwrite this but im deciding to use caution and investigate a little further first at what else I might have done wrong as id rather not destroy the entire systems installation by mistake.


Update----

So the cause of my error was me incorrectly using the syntax controlling the destination directory I incorrectly assumed that I could pass it as an additional argument but what I needed to do was set DESTDIR = "destination" I now have a fresh installation of glibc

The next step is building and testing some code with the newly installed library.

Comments

Post a Comment

Popular posts from this blog

project update 4 - testing

Image
Hi, in this post I will be covering my findings during the testing phase of the project. I initially built the application on an AArch64 linux system, I had no issues building the file as per the github instructions under the POSIX section. I used perf report to profile the application. but before I continue I should note that in all data obtained from tests used four this post on all platforms with the flags --verbouse --quality 84 on the application run. I tested using a sample png file that was provided, I successfully converted and compressed the file from png to jpeg multiple times on both windows x86_64 and linux Aarch64 platforms. Before After I should note that during my testing I did test with several other png images and some were rejected by the applications for reasons I have not yet narrowed down, this is an example of one such image. The choice of the specific image has no relavance to the test it just happened to be on my computer so I used it as test dat...
Read more

Project plan

Hello, this  blog post is to document my progress on the SPO600 project, I have selected a potential package to optimize the LZMA SDK found at https://www.7-zip.org/sdk.html. At first I was unsure if I wanted to try working with the package because of how the directory's and make files were setup. But there is a folder called ASM containing assembler optimizations for both arm and x86 systems, however is only one optimization for arm32 bit systems used for crc calculations while there are many for x86. If it was worth while to write an optimization for arm32 it may be beneficial to arm64 systems to have that code ported. So my initial plan for this project will be to attempt to port the code in the file 7zCrcOpt.asm to run on arm64 bit systems, I will first benchmark a use case that world normally use this 32bit optimization on a 64bit system to get a idea of how the performance currently would be without it. Then I will attempt to port the code and re run the same series of test...
Read more

My expeeriance so far.

Since the start of taking the course SPO600 I have learned allot, and tried allot of new things, But to date I have been rather silent about it regarding the blogs, so I'm going to dedicate this post to some of the things that stuck out to me. One of the first things we did is generate a public an private ssh key to use for the class servers, and prior to my first class I knew nothing about ssh keys. and I am surprised I did not know anything about them prior considering how commonly they are used. An ssh key is basically a long randomly generated number used in a math formula to lither encrypt data or decrypt it. ssh keys are normally generated in pairs, the public key is responsible for encrypting data, and only the corresponding private key can decrypt that data. so that means even if the public key gets into the hands of an attacker, as long as the private key is kept safe they cant decrypt the data without spending allot of time brute force calculating what the private key is...
Read more