HP UX IPFilter Software manual Dcache Measurement Report Description

Example 6 Example of a dcache Report for a Superdome Integrity Server

Function Details

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% Total

Avg.

---Latency

buckets

as % Misses---

Dcache

Sampled

Dcache

Dcache

L2 --

L3--

loc

loc

1

2

1&2

Line

Latency

Dcache

Latency

Laten.

c2c

mem hop

hop

c2c

Slot

>Statement

Cycles

Misses

Cycles

Cycles

Col,Offset

Instruction

714 64 150 350 650 800 >800

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56.19[caliper::ipack_encode_chain, 0x4000000000335900, ipack.c]

321018	9111771	28.3	23	12	11	8	12	14	10	10	~4518	Function Totals
-------------------------------------------------------------
[/CLO/Components/Caliper/Src/encode/ipack.c]
(262028)	(8464760)	(32.3)	20 22	10		8	9 14	6	11		278 >	instr = instr->next;
0	0										5,0x00e0:0	M_	adds
r8=8,r35 ;;
262028	8464760	32.3	20	22	10	8	9	14	6	11	:1	M	ld8
r35=[r8]
0	0										:2	I	nop.i	0
											5,0x00f0:0	M	nop.m	0
											:1	M	nop.m	0
											:2	B_	br.dptk
{self}+0x920 ;;

Using the --dcache-data-profile Option to Produce a Data Summary

To get a Data Summary output, you need to use the --dcache-data-profileoption. The dcache measurement does not produce the Data Summary by default.

The Data Summary shows a histogram of data accessed by location. Each sample records the data address that is accessed. If a data address belongs to a global variable, the sample is attributed to the global variable. Otherwise, the data address is mapped to a process region such as text, data, heap, stack, and so forth.

If a data address cannot be determined to belong to a global variable or a process region, it is shown as an unknown sample. The data address is appended to the symbol name. An example entry might be *unknown_0x9fffffffbf789378*, where the data address 0x9fffffffbf789378 was a data cache miss, but it was not assigned to any global variable or process region.

An example of Data Summary output is shown below:

Data Summary

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% Total				Avg.	---Latency buckets as % Misses--
Dcache	Cumulat	Sampled	Dcache	Dcache	L2	--L3	-- ------Memory-------
Latency	% of	Dcache	Latency	Laten.
Cycles	Total	Misses	Cycles	Cycles	7	14	64 150 250 350 450 > Data Entry

---------------------------------------------------------------------------------------------------------------

66.82	66.82	42	580	13.8	62	29	7	0	0	2	0	0	Heap
7.72	74.54	10	67	6.7	80	20	0	0	0	0	0	0	Memory mapped shared library
5.65	80.18	5	49	9.8	40	60	0	0	0	0	0	0	Process Text Region
4.84	85.02	4	42	10.5	25	50	25	0	0	0	0	0	libc.so.1::_arena_rmutex
4.72	89.75	5	41	8.2	40	60	0	0	0	0	0	0	Process Data Region

The Data Entry column shows the global variable name, process region name, or unknown data address.

The process regions are:

•Process Text Region - the address space occupied by the process text/instructions

•Process Data Region - the address space occupied by initialized data and uninitialized data (.bss)

•Heap - the address space where dynamically allocated memory resides

•Data and Heap combined - when HP Caliper cannot discover the data and heap regions separately

•Process Stack Region - the user stack area

•Shared mem - all the shared memory areas mapped to the process

dcache Measurement Report Description 199