compression

问题 I have a table which stores e-mail correspondences. Every time someone replies, the whole body of the trail is also included and saved into the database (and I need it that way because the amount of application level changes to rectify that are going to be too high). The size of the mail text column is 10000 . But, I am having trouble storing text more than that. As I am not sure, how many correspondences can occur, I don't know what a good number will be for the column. The engine is InnoDB

问题 I want to compress many non-overlapping rectangles into larger rectangles When they are adjacent. Pseudo-code for my current algorithm: do compress horizontally using sweep and prune compress horizontal output vertically using sweep and prune while (this output is small than previous output) Here's a link to sweep and prune. This is working well, but I want to know if there are approaches which result in fewer rectangles output. I figure there's more sophisticated than what I'm doing now. 回答1

问题 I am looking for the fastest way to read a sequential file from disk. I read in some posts that if I compressed the file using, for example, lz4, I could achieve better performance than read the flat file, because I will minimize the i/o operations. But when I try this approach, scanning a lz4 compressed file gives me a poor performance than scanning the flat file. I didn't try the lz4demo above, but looking for it, my code is very similar. I have found this benchmarks: http://skipperkongen

问题 I have a program which makes lots of HttpWebRequests, and I read about using gzip compression to speed up the downloading of the response data. I know what gzip is, and how it works, but I don't know how it works in C#. Let's say I have a simple GET request: HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://google.com"); request.Method = "GET"; WebResponse response = request.GetResponse(); How could I make the response data be compressed in gzip? How can I show the compressed

问题 The application keeps receiving objects named Report and put the objects into Disruptor for three different consumers. With the help of Eclipse Memory Analysis, the Retained Heap Size of each Report object is 20KB on average. The application starts with -Xmx2048 , indicating the heap size of the application is 2GB. However, the number of the objects is around 100,000 at a time, which means that the total size of all the object is roughly 2GB. The requirement is that all 100,000 objects should

问题 Is there a compression tool that will let you output its dictionary (or similar) separate from the compressed output such that the dictionary can be re-used on a subsequent compression? The idea would be to transfer the dictionary one time, or use a reference dictionary at a remote site, and make a compressed file even smaller to transfer. I've looked at the docs for a bunch of common compression tools, and I can't really find one that supports this. But most common compression tools aren't

问题 I have just installed django-pipeline into my django application and it doesn't seem to be compressing my javascript files. It seems to be installed properly as the template tags are working correctly. I'm using manage.py collectstatic in order to compress the files. Here is my current configuration. I have also set up my app to use django-staticfiles per the django-pipeline docs as I'm using Django 1.3. STATIC_ROOT = os.path.join(PROJECT_ROOT, 'site_media', 'static') STATIC_URL = '/site

问题 I have just installed django-pipeline into my django application and it doesn't seem to be compressing my javascript files. It seems to be installed properly as the template tags are working correctly. I'm using manage.py collectstatic in order to compress the files. Here is my current configuration. I have also set up my app to use django-staticfiles per the django-pipeline docs as I'm using Django 1.3. STATIC_ROOT = os.path.join(PROJECT_ROOT, 'site_media', 'static') STATIC_URL = '/site

问题 I have a dump after java.util.zip.Deflater (can confirm it's valid because Java's Inflater opens it fine) and need to open it in .NET: byte[] content = ReadSample(sampleName); var input = new MemoryStream(content); var output = new MemoryStream(); using (var z = new System.IO.Compression.DeflateStream(input, CompressionMode.Decompress, true)) z.CopyTo(output); This throws System.IO.InvalidDataException : Block length does not match with its complement. Tried Ionic.Zlib.DeflateStream - similar

问题 I have a large theoretical string (104 characters long) database generation program that returns results measured in petabytes. I don't have that much computing power so I would like to filter the low complexity strings from the database. My grammer is a modified form of the English alphabet with no numerical characters. I read about Kolmogorov Complexity and how it is theoretically impossible to calculate but I just need something basic in C# using compression. Using these two links How to