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Questions tagged [fragmentation]

An unefficient usage of disk storage in memory or hard drive.

189 questions
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How might one go about implementing a disk fragmenter?

I have a few ideas I would like to try out in the Disk Defragmentation Arena. I came to the conclusion that as a precursor to the implementation, it would be useful, to be able to put a disk into a state where it was fragmented. This seems to me…
EvilTeach
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Where can I find IP fragmented Sample pcaps for WireShark?

Are there any sources where I can find different pcaps samples for IP fragmented data (WireShark compatible)?
user349026
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Memory fragmentation @ boost::asio?

I'm pretty much stuck with a question I never got an answer for, a question which addresses an extremely important issue; memory fragmentation at boost::asio. Found nothing at the documentation nor here at SO. The async functions at boost::asio, for…
Poni
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What is the difference between compaction and defragmentation?

My operating systems textbook says that compaction is a process that rearranges disk blocks such that all free disk blocks form a contiguous "chunk" of free disk space. But I always thought that was what defragmentation does? Are these two terms the…
vladimirm
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Fail to malloc big block memory after many malloc/free small blocks memory

Here is the code. First I try to malloc and free a big block memory, then I malloc many small blocks memory till it run out of memory, and I free ALL those small blocks. After that, I try to malloc a big block memory. #include #include…
Celebi
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C#: Is there an Advantage to Disposing Resources in Reverse Order of their Allocation?

Many years ago, I was admonished to, whenever possible, release resources in reverse order to how they were allocated. That is: block1 = malloc( ... ); block2 = malloc( ... ); ... do stuff ... free( block2 ); free( block1 ); I imagine on a 640K…
Bob Kaufman
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How can I limit file fragmentation while working with .NET?

In my application I am gathering small data bits into a bigger file over time. As a result, the target file becomes excessively fragmented. What can be done to limit fragmentation of the output file with .NET?
GregC
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25k Inserts Daily, 99% Fragmentation on Clustered GUID Index

I have a table that has a primary key as a clustered GUID field; I'm generating GUIDs using NEWSEQUENTIALID() instead of NEWID. Unfortunately, because this table sees ~25k-100k inserts per day, within a few hours the (default: clustered) primary…
ashes999
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Measure (Android) heap fragmentation?

We have an app with lots of bitmaps in memory. It keeps failing with java.lang.OutOfMemoryError: bitmap size exceeds VM budget errors. It's possible that we are genuinely using too much memory; it's possible that we are leaking memory; it's also…
Jon Shemitz
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How frequently IP packets are fragmented at the source host?

I know that if IP payload > MTU then routers usually fragment the IP packet. Finally all the fragmented packets are assembled at the destination using the fields IP-ID, IP fragment offsets and fragmentation flags. Max length of IP payload is 64K.…
Methos
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Has AAC+ support been fixed on all Android phones?

I'd like to switch from using MP3 encoded audio files to AAC+ for voice sound files stored inside an Android app. This will make the install size smaller. A problem I encountered is that AAC+ support was broken in the Froyo release of…
Lance Nanek
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Out of memory error android due to fragmentation after 20+days

I made a application that runs on a coffee machine.After 20+ days (can be 60+ days depending on use) an OutOfMemoryError occurs: java.lang.OutOfMemoryError: Failed to allocate a 604 byte allocation with 16777216 free bytes and 319MB until OOM;…
Steven Goossens
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C# I/O async (copyAsync): how to avoid file fragmentation?

Within a tool copying big files between disks, I replaced the System.IO.FileInfo.CopyTo method by System.IO.Stream.CopyToAsync. This allow a faster copy and a better control during the copy, e.g. I can stop the copy. But this create even more…
EricBDev
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APC Fragmentation

I have APC with my Wordpress website See my APC summary page here http://www.animefushigi.com/apc.php I notice I have a very high amount of fragments (over 10,000) Is this a bad thing? Will it decrease performance?
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How to optimize the tables in information_Schema database

I got the free space (fragmentation issues) in my information_Schema database. Alert shows that there are 1500% free space in some tables like COLUMNS , ROUTINES. I am worried how this is possible because i don't have any routines in my database and…
Aman Aggarwal
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