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77d7b6eebb
Fixes #17928. Supercedes #17931. Reviewed-by: Tim Hudson <tjh@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17935)
70 lines
2.3 KiB
Plaintext
70 lines
2.3 KiB
Plaintext
=pod
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=head1 NAME
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OPENSSL_LH_stats, OPENSSL_LH_node_stats, OPENSSL_LH_node_usage_stats,
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OPENSSL_LH_stats_bio,
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OPENSSL_LH_node_stats_bio, OPENSSL_LH_node_usage_stats_bio - LHASH statistics
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=head1 SYNOPSIS
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#include <openssl/lhash.h>
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void OPENSSL_LH_stats(LHASH *table, FILE *out);
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void OPENSSL_LH_node_stats(LHASH *table, FILE *out);
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void OPENSSL_LH_node_usage_stats(LHASH *table, FILE *out);
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void OPENSSL_LH_stats_bio(LHASH *table, BIO *out);
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void OPENSSL_LH_node_stats_bio(LHASH *table, BIO *out);
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void OPENSSL_LH_node_usage_stats_bio(LHASH *table, BIO *out);
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=head1 DESCRIPTION
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The B<LHASH> structure records statistics about most aspects of
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accessing the hash table.
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OPENSSL_LH_stats() prints out statistics on the size of the hash table and how
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many entries are in it. For historical reasons, this function also outputs a
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number of additional statistics, but the tracking of these statistics is no
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longer supported and these statistics are always reported as zero.
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OPENSSL_LH_node_stats() prints the number of entries for each 'bucket' in the
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hash table.
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OPENSSL_LH_node_usage_stats() prints out a short summary of the state of the
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hash table. It prints the 'load' and the 'actual load'. The load is
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the average number of data items per 'bucket' in the hash table. The
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'actual load' is the average number of items per 'bucket', but only
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for buckets which contain entries. So the 'actual load' is the
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average number of searches that will need to find an item in the hash
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table, while the 'load' is the average number that will be done to
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record a miss.
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OPENSSL_LH_stats_bio(), OPENSSL_LH_node_stats_bio() and OPENSSL_LH_node_usage_stats_bio()
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are the same as the above, except that the output goes to a B<BIO>.
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=head1 RETURN VALUES
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These functions do not return values.
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=head1 NOTE
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These calls should be made under a read lock. Refer to
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L<OPENSSL_LH_COMPFUNC(3)/NOTE> for more details about the locks required
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when using the LHASH data structure.
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=head1 SEE ALSO
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L<bio(7)>, L<OPENSSL_LH_COMPFUNC(3)>
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=head1 COPYRIGHT
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Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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