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A Tool to Model Caches/Memories
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CACTI is an analytical tool that takes a set of cache/memory para-
meters as input and calculates its access time, power, cycle
time, and area.
CACTI was originally developed by Dr. Jouppi and Dr. Wilton
in 1993 and since then it has undergone five major
revisions.
List of features (version 1-6.5):
===============================
The following is the list of features supported by the tool.
* Power, delay, area, and cycle time model for
direct mapped caches
set-associative caches
fully associative caches
Embedded DRAM memories
Commodity DRAM memories
* Support for modeling multi-ported uniform cache access (UCA)
and multi-banked, multi-ported non-uniform cache access (NUCA).
* Leakage power calculation that also considers the operating
temperature of the cache.
* Router power model.
* Interconnect model with different delay, power, and area
properties including low-swing wire model.
* An interface to perform trade-off analysis involving power, delay,
area, and bandwidth.
* All process specific values used by the tool are obtained
from ITRS and currently, the tool supports 90nm, 65nm, 45nm,
and 32nm technology nodes.
Version 6.5 has a new c++ code base and includes numerous bug fixes.
CACTI 5.3 and 6.0 activate an entire row of mats to read/write a single
block of data. This technique improves reliability at the cost of
power. CACTI 6.5 activates minimum number of mats just enough to retrieve
a block to minimize power.
How to use the tool?
====================
Prior versions of CACTI take input parameters such as cache
size and technology node as a set of command line arguments.
To avoid a long list of command line arguments,
CACTI 6.5 lets users specify their cache model in a more
detailed manner by using a config file (cache.cfg).
-> define the cache model using cache.cfg
-> run the "cacti" binary <./cacti -infile cache.cfg>
CACTI6.5 also provides a command line interface similar to earlier versions
of CACTI. The command line interface can be used as
./cacti cache_size line_size associativity rw_ports excl_read_ports excl_write_ports
single_ended_read_ports search_ports banks tech_node output_width specific_tag tag_width
access_mode cache main_mem obj_func_delay obj_func_dynamic_power obj_func_leakage_power
obj_func_cycle_time obj_func_area dev_func_delay dev_func_dynamic_power dev_func_leakage_power
dev_func_area dev_func_cycle_time ed_ed2_none temp wt data_arr_ram_cell_tech_flavor_in
data_arr_peri_global_tech_flavor_in tag_arr_ram_cell_tech_flavor_in tag_arr_peri_global_tech_flavor_in
interconnect_projection_type_in wire_inside_mat_type_in wire_outside_mat_type_in
REPEATERS_IN_HTREE_SEGMENTS_in VERTICAL_HTREE_WIRES_OVER_THE_ARRAY_in
BROADCAST_ADDR_DATAIN_OVER_VERTICAL_HTREES_in PAGE_SIZE_BITS_in BURST_LENGTH_in
INTERNAL_PREFETCH_WIDTH_in force_wiretype wiretype force_config ndwl ndbl nspd ndcm
ndsam1 ndsam2 ecc
For complete documentation of the tool, please refer CACTI-5.3 and 6.0
technical reports and the following paper,
"Optimizing NUCA Organizations and Wiring Alternatives for
Large Caches With CACTI 6.0", that appears in MICRO 2007.
We are still improving the tool and refining the code. If you
have any comments, questions, or suggestions please write to
us.
Naveen Muralimanohar Jung Ho Ahn Sheng Li
naveen.muralimanohar@hp.com gajh@snu.ac.kr sheng.li@hp.com
