Product Documentation
Cadence SKILL Development Reference
Product Version IC23.1, June 2023

gcsummary

gcsummary( 
) 
=> t

Description

Prints a summary of memory allocation and garbage collection statistics in the current SKILL run.

Arguments

None

Value Returned

t

Always returns t.

Examples

************* SUMMARY OF MEMORY ALLOCATION *************
Maximum Process Size (i.e., voMemoryUsed) = 3589448
Total Number of Bytes Allocated by IL = 2366720
Total Number of Static Bytes          = 1605632
-----------------------------------------------------------
Type       Size   Allocated     Free      Static   GC count
-----------------------------------------------------------
list         12      339968    42744     1191936          9
fixnum        8       36864    36104       12288          0
flonum       16        4096     2800       20480          0
string        8       90112    75008       32768          0
symbol       28           0        0      303104          0
binary       16           0        0        8192          0
port         60        8192     7680           0          0
array        16       20480     8288        8192          0
wtype        16       16384    16224           0          0
TOTALS       --      516096   188848     1576960          9
-----------------------------------------------------------
User Type (ID)             Allocated     Free    GC count
-----------------------------------------------------------
hiField              (20)       8192     7504           0
hiToggleItem         (21)       8192     7900           0
hiMenu               (22)       8192     7524           0
hiMenuItem           (23)       8192     5600           0
TOTALS                --       32768    28528           0
-----------------------------------------------------------
Bytes allocated for : 
      arrays       = 38176
      strings      = 43912
      strings(perm)= 68708
      IL stack     = 49140
      (Internal)   = 12288
TOTAL GC COUNT 9 
----- Summary of Symbol Table Statistics -----
Total Number of Symbols = 11201
Hash Buckets Occupied = 4116 out of 4499
Average chain length = 2.721331
t

How to Interpret the Summary Report

Column Contains

Type

Data type names.

Size

Size of each atom representing the data type in bytes.

Allocated

Total number of bytes allocated in the pool for the data type.

Free

Number of bytes that are free and available for allocation.

Static

Memory allocated in static pools that are not subject to GC. This memory is usually generated when contexts are built. When variables are write protected, their contents are shifted to static pools.

GC Count

Number of GC cycles triggered because the pool for this data type was exhausted.

Related Topics

Debug Functions

profileSummary


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