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Diffstat (limited to 'system/doc/efficiency_guide/advanced.xml')
| -rw-r--r-- | system/doc/efficiency_guide/advanced.xml | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/system/doc/efficiency_guide/advanced.xml b/system/doc/efficiency_guide/advanced.xml index d4e47f4f10..e1760d0ded 100644 --- a/system/doc/efficiency_guide/advanced.xml +++ b/system/doc/efficiency_guide/advanced.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2001</year><year>2013</year> + <year>2001</year><year>2016</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -35,8 +35,7 @@ how much memory different data types and operations require. It is implementation-dependent how much memory the Erlang data types and other items consume, but the following table shows some figures for - the <c>erts-5.2</c> system in R9B. There have been no significant - changes in R13.</p> + the <c>erts-8.0</c> system in OTP 19.0.</p> <p>The unit of measurement is memory words. There exists both a 32-bit and a 64-bit implementation. A word is therefore 4 bytes or @@ -87,6 +86,19 @@ <cell>2 words + the size of each element.</cell> </row> <row> + <cell>Small Map</cell> + <cell>5 words + the size of all keys and values.</cell> + </row> + <row> + <cell>Large Map (> 32 keys)</cell> + <cell> + <c>N</c> x <c>F</c> words + the size of all keys and values.<br></br> + <c>N</c> is the number of keys in the Map.<br></br> + <c>F</c> is a sparsity factor that can vary between 1.6 and 1.8 + due to the probabilistic nature of the internal HAMT data structure. + </cell> + </row> + <row> <cell>Pid</cell> <cell>1 word for a process identifier from the current local node + 5 words for a process identifier from another node.<br></br> @@ -122,7 +134,7 @@ </row> <row> <cell>Erlang process</cell> - <cell>327 words when spawned, including a heap of 233 words.</cell> + <cell>338 words when spawned, including a heap of 233 words.</cell> </row> <tcaption>Memory Size of Different Data Types</tcaption> </table> @@ -144,7 +156,7 @@ <seealso marker="erts:erl#max_processes"><c>+P</c></seealso> command-line flag in the <seealso marker="erts:erl"><c>erl(1)</c></seealso> - manual page in <c>erts</c>.</cell> + manual page in ERTS.</cell> </row> <row> <cell>Known nodes</cell> @@ -224,7 +236,7 @@ <seealso marker="erts:erl#max_ports"><c>+Q</c></seealso> command-line flag in the <seealso marker="erts:erl"><c>erl(1)</c></seealso> manual page - in <c>erts</c>.</cell> + in ERTS.</cell> </row> <row> <cell><marker id="files_sockets"></marker>Open files and |