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version
int version
version: Integer field containing the version number of this version
of the H5AC_cache_config_t structure. Any instance of
H5AC_cache_config_t passed to the cache must have a known
version number, or an error will be flagged.
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rpt_fcn_enabled
boolean rpt_fcn_enabled
rpt_fcn_enabled: Boolean field used to enable and disable the default
reporting function. This function is invoked every time the
automatic cache resize code is run, and reports on its activities.
This is a debugging function, and should normally be turned off.
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open_trace_file
boolean open_trace_file
open_trace_file: Boolean field indicating whether the trace_file_name
field should be used to open a trace file for the cache.
*** DEPRECATED *** Use H5Fstart/stop logging functions instead
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close_trace_file
boolean close_trace_file
close_trace_file: Boolean field indicating whether the current trace
file (if any) should be closed.
*** DEPRECATED *** Use H5Fstart/stop logging functions instead
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trace_file_name
String trace_file_name
trace_file_name: Full path of the trace file to be opened if the
open_trace_file field is TRUE.
*** DEPRECATED *** Use H5Fstart/stop logging functions instead
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evictions_enabled
boolean evictions_enabled
evictions_enabled: Boolean field used to either report the current
evictions enabled status of the cache, or to set the cache's
evictions enabled status.
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set_initial_size
boolean set_initial_size
set_initial_size: Boolean flag indicating whether the size of the
initial size of the cache is to be set to the value given in
the initial_size field. If set_initial_size is FALSE, the
initial_size field is ignored.
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initial_size
long initial_size
initial_size: If enabled, this field contain the size the cache is
to be set to upon receipt of this structure. Needless to say,
initial_size must lie in the closed interval [min_size, max_size].
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min_clean_fraction
double min_clean_fraction
min_clean_fraction: double in the range 0 to 1 indicating the fraction
of the cache that is to be kept clean. This field is only used
in parallel mode. Typical values are 0.1 to 0.5.
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max_size
long max_size
max_size: Maximum size to which the cache can be adjusted. The
supplied value must fall in the closed interval
[MIN_MAX_CACHE_SIZE, MAX_MAX_CACHE_SIZE]. Also, max_size must
be greater than or equal to min_size.
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min_size
long min_size
min_size: Minimum size to which the cache can be adjusted. The
supplied value must fall in the closed interval
[H5C__MIN_MAX_CACHE_SIZE, H5C__MAX_MAX_CACHE_SIZE]. Also, min_size
must be less than or equal to max_size.
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epoch_length
long epoch_length
epoch_length: Number of accesses on the cache over which to collect
hit rate stats before running the automatic cache resize code,
if it is enabled.
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incr_mode
int incr_mode
incr_mode: Instance of the H5C_cache_incr_mode enumerated type whose
value indicates how we determine whether the cache size should be
increased. At present there are two possible values.
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lower_hr_threshold
double lower_hr_threshold
lower_hr_threshold: Lower hit rate threshold. If the increment mode
(incr_mode) is H5C_incr__threshold and the hit rate drops below the
value supplied in this field in an epoch, increment the cache size by
size_increment. Note that cache size may not be incremented above
max_size, and that the increment may be further restricted by the
max_increment field if it is enabled.
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increment
double increment
increment: Double containing the multiplier used to derive the new
cache size from the old if a cache size increment is triggered.
The increment must be greater than 1.0, and should not exceed 2.0.
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apply_max_increment
boolean apply_max_increment
apply_max_increment: Boolean flag indicating whether the max_increment
field should be used to limit the maximum cache size increment.
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max_increment
long max_increment
max_increment: If enabled by the apply_max_increment field described
above, this field contains the maximum number of bytes by which the
cache size can be increased in a single re-size.
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flash_incr_mode
int flash_incr_mode
flash_incr_mode: Instance of the H5C_cache_flash_incr_mode enumerated
type whose value indicates whether and by which algorithm we should
make flash increases in the size of the cache to accommodate insertion
of large entries and large increases in the size of a single entry.
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flash_multiple
double flash_multiple
flash_multiple: Double containing the multiple described above in the
H5C_flash_incr__add_space section of the discussion of the
flash_incr_mode section. This field is ignored unless flash_incr_mode
is H5C_flash_incr__add_space.
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flash_threshold
double flash_threshold
flash_threshold: Double containing the factor by which current max cache
size is multiplied to obtain the size threshold for the add_space flash
increment algorithm. The field is ignored unless flash_incr_mode is
H5C_flash_incr__add_space.
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decr_mode
int decr_mode
decr_mode: Instance of the H5C_cache_decr_mode enumerated type whose
value indicates how we determine whether the cache size should be
decreased. At present there are four possibilities.
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upper_hr_threshold
double upper_hr_threshold
upper_hr_threshold: Upper hit rate threshold. The use of this field
varies according to the current decr_mode.
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decrement
double decrement
decrement: This field is only used when the decr_mode is
H5C_decr__threshold.
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apply_max_decrement
boolean apply_max_decrement
apply_max_decrement: Boolean flag used to determine whether decrements
in cache size are to be limited by the max_decrement field.
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max_decrement
long max_decrement
max_decrement: Maximum number of bytes by which the cache size can be
decreased in a single re-size. Note that decrements may also be
restricted by the min_size of the cache, and (in age out modes) by
the empty_reserve field.
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epochs_before_eviction
int epochs_before_eviction
epochs_before_eviction: Integer field used in H5C_decr__age_out and
H5C_decr__age_out_with_threshold decrement modes.
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apply_empty_reserve
boolean apply_empty_reserve
apply_empty_reserve: Boolean field controlling whether the empty_reserve
field is to be used in computing the new cache size when the
decr_mode is H5C_decr__age_out or H5C_decr__age_out_with_threshold.
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empty_reserve
double empty_reserve
empty_reserve: To avoid a constant racheting down of cache size by small
amounts in the H5C_decr__age_out and H5C_decr__age_out_with_threshold
modes, this field allows one to require that any cache size
reductions leave the specified fraction of unused space in the cache.
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dirty_bytes_threshold
long dirty_bytes_threshold
dirty_bytes_threshold: Threshold of dirty byte creation used to
synchronize updates between caches.
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metadata_write_strategy
int metadata_write_strategy
metadata_write_strategy: Integer field containing a code indicating the
desired metadata write strategy.