Max Files Open In Hpux
On UNIX systems, the ulimit command controls the limits on system resource, such as process data size, process virtual memory, and process file size. Specifically: On Solaris systems, by default, the root user has unlimited access to these resources (for example, unlimited). Download Max Files Open In Hpux. 8/1/2016 0 Comments HP- UX Operating System (Unix)HP- UX HP- UX is based on the UNIX System V Release 4 and was designed by HP for. Hello, we've had an issue with our system here that seems to indicate it having trouble with a 2GB file. It sounds like it would be the 2GB file system limit issue, except that i believe its set. Max File size with HP-UX 11.31.
What's the maxium number of files a Unix folder can hold?
I think it will be the same as the number of files.
Peter Mortensenmigrated from stackoverflow.comAug 27 '09 at 9:30
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6 Answers
Varies per file system, http://en.wikipedia.org/wiki/Comparison_of_file_systems
On all current Unix filesystems a directory can hold a practically unlimited number of files. Whereas 'unlimited' is limited by diskspace and inodes - whatever runs out first.
With older file system designs (ext2, UFS, HFS+) things tend to get slow if you have many files in a directory. Usually things start getting painful around 10,000 files. With newer filesystems (ReiserFS, XFS, ZFS, UFS2) you can have millions of files in a directory without seeing general performance bottlenecks.
Hp Ux 11
But having so many files in a directory is not well tested and there are lots of tools which fail that. For example, periodic system maintenance scripts may barf on it.
I happily used a directory with several million files on UFS2 and had seen no problems until I wanted to delete the directory - that took several DAYS.
Peter MortensenIt depends how many inodes the filesystem was created with. Executing
will give you the number of free inodes. This is the practical limit of how many files a filesystem and hence a directory can hold.
Peter MortensenI assume you are thinking of storing a lot of files in one place, no?
Most modern Unix files systems can put a lot of files in one directory, but operations like following paths, listing files, etc. involve a linear search through the list of files and get slow if the list grows too large.
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I seem to recall hearing that a couple of thousand is too many for most practical uses. The typically solution is to break the grouping up. That is,
and store your files in the appropriate sub-directory according to a hash of their basename. Choose a convenient hash, the first character might do for simple cases.
Cristian Ciupitu writes in the comments that XFS, and possibly other very new file-systems, use log(N) searchable structures to hold directory contents, so this constraint is greatly ameliorated.
ext3 one of the most common linux filesystem formats gets really sluggish if you have around 20k + file in a directory. Regardless of how many it can hold, you should try to avoid having that many files in one directory.
From the comment you left, I think you don't really care about how many files/folders your FS can host.
You should probably consider using ModRewrite and rewriting site.com/username to site.com/?user= or something of the kind and store all your data in a database. Creating one folder per user is generally not necessary (and not a good idea).
That said, each filesystem has limits, and df can tell you how many inodes are available on each partition of your system.
I am working on a Perl script that opens a huge file and which has the records in the below format. Script might run in Solaris 10 or HP UX 11.0
When I read the first field file name of the input file I need to create a new file if it doesn't exists and print the rest of the fields to the file. There might be 13000 unique file names in the input file. What is the maximum number of file handles that I can open in Solaris 10 or hpux 11? Will I be able to open 13000 file handles? I am planning to use a hash to store the file handles for writing it to the files and closing it. Also how can I easily get the unique file name from the first field across the whole file? Is there a easy way to do it rather than reading each line of the file?
Christopher Bottoms3 Answers
The maximum number of filehandles is OS depended (and is configurable)
See ulimit (manual page is here) Kodak all in one printer software install.
However opening that many file handles is unreasonable. Have a rethink about your algorithm.
Ed HealEd HealNo, there's no way to get all the unique filenames without reading the entire file. But you can generate this list as you're processing the file. When you read a line, add the filename as the key of a hash. At the end, print the keys of the hash.
BarmarMax Files Open In Hpux Shutdown
BarmarI don't know what your system allows, but you can open more file handles than your system permits using the FileCache module. This is a core Perl module, so you shouldn't even need to install it.
Hp Ux Operating System
There is no way to get the first column out of a text file without reading the whole file, because text files don't really have an internal structure of columns or even lines; they are just one long string of data. The only way to find each 'line' is to go through the whole file and look for newline characters.
However, even huge files are generally processed quite quickly by Perl. This is unlikely to be a problem. Here is simple code to get the unique filenames (assuming your file is opened as FILE):
This ends up with a count of how many times each file occurs. It assumes that your filenames don't contain any spaces. I did a quick test of this with >30,000 lines, and it was instantaneous.