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-<!--
-title: "PROCFILE"
-custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/procfile/README.md
-sidebar_label: "Procfile"
-learn_status: "Published"
-learn_topic_type: "Tasks"
-learn_rel_path: "Developers/libnetdata"
--->
-
-# PROCFILE
-
-procfile is a library for reading text data files (i.e `/proc` files) in the fastest possible way.
-
-## How it works
-
-The library automatically adapts (through the iterations) its memory so that each file
-is read with single `read()` call.
-
-Then the library splits the file into words, using the supplied separators.
-The library also supported quoted words (i.e. strings within of which the separators are ignored).
-
-### Initialization
-
-Initially the caller: 
-
--   calls `procfile_open()` to open the file and allocate the structures needed.
-
-### Iterations
-
-For each iteration, the caller:
-
--   calls `procfile_readall()` to read updated contents.
-     This call also rewinds (`lseek()` to 0) before reading it.
-
-     For every file, a [BUFFER](https://github.com/netdata/netdata/blob/master/libnetdata/buffer/README.md) is used that is automatically adjusted to fit the entire
-     file contents of the file. So the file is read with a single `read()` call (providing atomicity / consistency when
-     the data are read from the kernel).
-
-     Once the data are read, 2 arrays of pointers are updated:
-
-    -   a `words` array, pointing to each word in the data read
-    -   a `lines` array, pointing to the first word for each line
-
-     This is highly optimized. Both arrays are automatically adjusted to
-     fit all contents and are updated in a single pass on the data.
-
-     The library provides a number of macros:
-
-    -   `procfile_lines()` returns the # of lines read
-    -   `procfile_linewords()` returns the # of words in the given line
-    -   `procfile_word()` returns a pointer the given word #
-    -   `procfile_line()` returns a pointer to the first word of the given line #
-    -   `procfile_lineword()` returns a pointer to the given word # of the given line #
-
-### Cleanup
-
-When the caller exits:
-
--   calls `procfile_free()` to close the file and free all memory used.
-
-### Performance
-
--   a **raspberry Pi 1** (the oldest single core one) can process 5.000+ `/proc` files per second.
--   a **J1900 Celeron** processor can process 23.000+ `/proc` files per second per core.
-
-To achieve this kind of performance, the library tries to work in batches so that the code
-and the data are inside the processor's caches.
-
-This library is extensively used in Netdata and its plugins.
-
-