![]() ![]() In my tests, I found it gives a bit of a buffer. ![]() The cp command (which is very fast in my tests) uses just 128KB block size (see strace cp. Just for my interest, why are you using "bs=10M" for the dd command? Now I just use "cp" - its simple to use and fast enough in practice (slightly faster than dd bs=1m) I gave up trying to calculate everything and produce an optimal C program! So, given that the disk read times are near zero for this case only, whats the best read/write block size to give dd for the optimal overlap between reads and writes? įor example, I usually download the image to a memory disk, then uncompress it and copy it to the raw device. Given all the above variables, any simple benchmark results will be meaningless. Its incredibly complicated given: different read/download speeds, decompression speeds, indeterminate overlap between reads and writes, disk write speeds, variable asynchronous disk block prefetch ranges, "sync" time, verification time, etc etc ![]() To get a smaller file and accelerate the transfer of it.Believe it or not, with enough optimization, it can be faster to download an img, extract it, and flash it to a SD card, than to flash a local, pre-extracted. If what we want is to compress a file to share through the internet or a local network and we have enough RAM, the ideal is to use When we are going to work on systems with limited memory, it is preferable to use Gzip, since it needs less resources. To answer the question of whether Gzip is better than xz or why use one or the other, we have to point to its use, since weĬannot say that one is better than the other, but that they are used in different scenarios However, if we compare it with bzip2 it is more efficient both in compression ratio and in compression time, hence many users have already adopted the. xz format has the disadvantage that it requires more compression and decompression time, in addition to a larger amount of memory, but it offers us greater compression ratios. Get smaller file sizes, which are ideal for saving bandwidth in internet transfers. In this section I will extend a bit talking about thisįormat that seems to be gaining special importance when sharing files on the internet.Īnd offers greater efficiency than Gzip and even bzip2. Tar -Jcvf documento.txt Why use tar.xz instead of tar.gz? Is tar.xz better than Gzip (tar.gz)? If it is important to include it when we want to compress with the format Tool itself is able to identify the type of file.Ĭommand and we will get the same results. When we decompress it is not necessary to include this parameter , since if you put it in lowercase it will give you an error. It is very important to note that I have used the letter , we just have to execute the following command from the console: In the vast majority of current Linux systems it is not necessary to install any application or library to Tar: Error is not recoverable: exiting now How to unzip. Not work and will show the following error: Maybe the first thing that comes to your mind is to extract the. In this tutorial we show you how to unzip. You might have downloaded a file with this extension and Compression and decompression formats evolve while advancing technologies to meet new needs. ![]()
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