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What are the best open-source map/hash-table libraries for C?
10
Options
Considered
27
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Mar 15, 2023
Last
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10
Options
Considered
Best open-source map/hash-table libraries for C
Price
Last Updated
--
UTHash
-
Mar 15, 2023
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Judy Arrays
-
May 19, 2020
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Klib
-
Mar 31, 2021
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Libcfu's cfuhash
-
Jul 11, 2020
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SunriseDD (Sunrise Data Dictionary for C)
-
Jan 15, 2019
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--
UTHash
My Rec
ommendation
for
UTHash
My Recommendation for
UTHash
All
5
Pros
3
Cons
2
Top
Pro
•••
BSD license
UTHash is released under the BSD license, which allows its redistribution even for commercial use.
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Top
Con
•••
Not the fastest/slimmest option
There are other options which either show better performance characteristics or better memory usage (as in overhead per item), or sometimes both. Specific comparison micro benchmarks including plots for the data can be found here.
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Top
Pro
•••
Well documented
UTHash documentation is detailed, well organized and uses plenty of examples.
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Top
Con
•••
Lacks some basic API methods
For example, it doesn't have a method for counting the number of elements in a hash table.
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Top
Pro
•••
Easy to use
UTHash is straight forward to use and is easy to install.
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15
--
Judy Arrays
My Rec
ommendation
for
Judy Arrays
My Recommendation for
Judy Arrays
All
3
Pros
2
Cons
1
Top
Pro
•••
Memory efficient
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Top
Con
•••
Slow for random access and sparse keys
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Top
Pro
•••
Very cache-friendly when accessing things in order
Judy is pretty good at inserting and looking up keys in order. This makes Judy probably unbeatably the best when it comes to being cache-friendly.
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Recommend
4
--
Klib
My Rec
ommendation
for
Klib
My Recommendation for
Klib
All
1
Pros
1
Top
Pro
•••
Strong documentation
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here
Recommend
5
--
Libcfu's cfuhash
My Rec
ommendation
for
Libcfu's cfuhash
My Recommendation for
Libcfu's cfuhash
All
2
Pros
2
Top
Pro
•••
Simple to use
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Top
Pro
•••
Easy to modify
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Recommend
1
--
SunriseDD (Sunrise Data Dictionary for C)
My Rec
ommendation
for
SunriseDD (Sunrise Data Dictionary for C)
My Recommendation for
SunriseDD (Sunrise Data Dictionary for C)
All
2
Pros
2
Top
Pro
•••
Well-documented source code
SunriseDD's source code is very well documented.
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Top
Pro
•••
Implements a lock-free hash table
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Recommend
1
--
Hashit
My Rec
ommendation
for
Hashit
My Recommendation for
Hashit
All
1
Cons
1
Top
Con
•••
Support for only static hash tables
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Recommend
1
--
CMPH - C Minimal Perfect Hashing Library
My Rec
ommendation
for
CMPH - C Minimal Perfect Hashing Library
My Recommendation for
CMPH - C Minimal Perfect Hashing Library
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Recommend
--
GLib's GHashTable
My Rec
ommendation
for
GLib's GHashTable
My Recommendation for
GLib's GHashTable
All
2
Pros
1
Cons
1
Top
Pro
•••
Very fast
GLib's GHashTable is one of the fastest overall of the open source implementations you can benchmark. It has low memory use as well.
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Top
Con
•••
Only has support for 32-bit
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--
TommyDS
My Rec
ommendation
for
TommyDS
My Recommendation for
TommyDS
All
2
Pros
1
Cons
1
Top
Pro
•••
Actively developed
TommyDS is actively developed by the creator.
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Top
Con
•••
Poorly formatted documentation
The documentation is poorly organized, and requires some searching before finding what you're looking for. The styling used to display the explanations can be hard on the eyes.
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--
libghthash
My Rec
ommendation
for
libghthash
My Recommendation for
libghthash
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