Add stream header documentation
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doc/fig/stream.svg
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After Width: | Height: | Size: 18 KiB |
@ -1,7 +1,7 @@
|
||||
# Trace specification version 1
|
||||
|
||||
The ovni instrumentation library produces a trace with the following
|
||||
specification.
|
||||
The ovni instrumentation library stores the information collected in a
|
||||
trace following the specification of this document.
|
||||
|
||||
The complete trace is stored in a top-level directory named "ovni".
|
||||
Inside this directory you will find the loom directories with the prefix
|
||||
@ -15,7 +15,7 @@ specified in the `pid` argument to `ovni_proc_init()`.
|
||||
Each process directory contains:
|
||||
|
||||
- The metadata file `metadata.json`.
|
||||
- The thread traces with prefix `thread.`.
|
||||
- The thread streams with prefix `thread.`.
|
||||
|
||||
## Process metadata
|
||||
|
||||
@ -27,6 +27,8 @@ The metadata is stored in the JSON file `metadata.json` inside each
|
||||
process directory and contains the following keys:
|
||||
|
||||
- `version`: a number specifying the version of the metadata format.
|
||||
- `model_version`: a string with the version of each model supported by
|
||||
the emulator.
|
||||
- `app_id`: the application ID, used to distinguish between applications
|
||||
running on the same loom.
|
||||
- `rank`: the rank of the MPI process (optional).
|
||||
@ -38,27 +40,66 @@ process directory and contains the following keys:
|
||||
- `phyid`: the number of the CPU as given by the operating system
|
||||
(which can exceed $`N_c`$).
|
||||
|
||||
## Thread trace
|
||||
Here is an example of the `metadata.json` file:
|
||||
|
||||
The thread trace is a binary file composed of events joined one after
|
||||
the other. Each event has a header with the following information:
|
||||
```
|
||||
{
|
||||
"version": 1,
|
||||
"model_version": "O1 V1 T1 M1 D1 K1",
|
||||
"app_id": 1,
|
||||
"rank": 0,
|
||||
"nranks": 4,
|
||||
"cpus": [
|
||||
{
|
||||
"index": 0,
|
||||
"phyid": 0
|
||||
},
|
||||
{
|
||||
"index": 1,
|
||||
"phyid": 1
|
||||
},
|
||||
{
|
||||
"index": 2,
|
||||
"phyid": 2
|
||||
},
|
||||
{
|
||||
"index": 3,
|
||||
"phyid": 3
|
||||
}
|
||||
]
|
||||
}
|
||||
```
|
||||
|
||||
## Thread streams
|
||||
|
||||
Streams are a binary files that contains a succession of events with
|
||||
monotonically increasing clock values. Streams have a small header and
|
||||
the variable size events just after the header.
|
||||
|
||||
The header contains the magic 4 bytes of "ovni" and a version number of
|
||||
4 bytes too. Here is a figure of the data stored in disk:
|
||||
|
||||
<img src="fig/stream.svg" alt="Stream" width="400px"/>
|
||||
|
||||
Similarly, events have a fixed size header followed by an optional
|
||||
payload of varying size. The header has the following information:
|
||||
|
||||
- Event flags
|
||||
- Payload size in a special format
|
||||
- Model, category and value codes
|
||||
- Time in nanoseconds
|
||||
- Payload (optional)
|
||||
|
||||
The payload size is specified using 4 bits, with the value `0x0` for no
|
||||
payload, or with value $`v`$ for $`v + 1`$ bytes of payload. This
|
||||
allows us to use 16 bytes of payload with value `0xf` at the cost of
|
||||
The event size can vary depending on the data stored in the payload. The
|
||||
payload size is specified using 4 bits, with the value `0x0` for no
|
||||
payload, or with value $`v`$ for $`v + 1`$ bytes of payload. This allows
|
||||
us to use 16 bytes of payload with value `0xf` at the cost of
|
||||
sacrificing payloads of one byte.
|
||||
|
||||
There are two types of events, depending of the size needed for the
|
||||
payload:
|
||||
|
||||
- Normal: with a payload up to 16 bytes
|
||||
- Jumbo: with a payload up to 2^32 bytes
|
||||
- Normal events: with a payload up to 16 bytes
|
||||
- Jumbo events: with a payload up to 2^32 bytes
|
||||
|
||||
## Normal events
|
||||
|
||||
@ -74,8 +115,7 @@ Here is an example of a normal event without payload, a total of 12
|
||||
bytes:
|
||||
|
||||
```
|
||||
% dd if=thread.552943 skip=5258 bs=1 | hexdump -C
|
||||
00000000 00 4f 48 65 01 c5 cf 1d 96 d0 12 00 |.OHe........|
|
||||
00 4f 48 65 01 c5 cf 1d 96 d0 12 00 |.OHe........|
|
||||
```
|
||||
|
||||
And in the following figure you can see every field annotated:
|
||||
@ -83,12 +123,11 @@ And in the following figure you can see every field annotated:
|
||||
<img src="fig/event-normal.svg" alt="Normal event without payload" width="400px"/>
|
||||
|
||||
Another example of a normal event with 16 bytes of payload, a total of
|
||||
28 bytes as reported by hexdump:
|
||||
28 bytes:
|
||||
|
||||
```
|
||||
% dd if=thread.552943 bs=1 count=28 | hexdump -C
|
||||
00000000 0f 4f 48 78 58 c1 b0 b5 95 43 11 00 00 00 00 00 |.OHxX....C......|
|
||||
00000010 ff ff ff ff 00 00 00 00 00 00 00 00 |............|
|
||||
0f 4f 48 78 58 c1 b0 b5 95 43 11 00 00 00 00 00 |.OHxX....C......|
|
||||
ff ff ff ff 00 00 00 00 00 00 00 00 |............|
|
||||
```
|
||||
|
||||
In the following figure you can see each field annotated:
|
||||
@ -112,8 +151,8 @@ Example of a jumbo event of 30 bytes in total, with 14 bytes of jumbo
|
||||
data:
|
||||
|
||||
```
|
||||
00000000 13 56 59 63 eb c1 4b 1a 96 d0 12 00 0e 00 00 00 |.VYc..K.........|
|
||||
00000010 01 00 00 00 74 65 73 74 74 79 70 65 31 00 |....testtype1.|
|
||||
13 56 59 63 eb c1 4b 1a 96 d0 12 00 0e 00 00 00 |.VYc..K.........|
|
||||
01 00 00 00 74 65 73 74 74 79 70 65 31 00 |....testtype1.|
|
||||
```
|
||||
|
||||
In the following figure you can see each field annotated:
|
||||
@ -122,38 +161,43 @@ In the following figure you can see each field annotated:
|
||||
|
||||
## Design considerations
|
||||
|
||||
The trace format has been designed to be very simple, so writing a
|
||||
parser library would take no more than 2 days.
|
||||
The stream format has been designed to be very simple, so writing a
|
||||
parser library would take no more than 2 days for a single developer.
|
||||
|
||||
The common events don't use any payload, so the size per event is kept
|
||||
at the minimum of 12 bytes.
|
||||
The size of the events has been designed to be small, with 12 bytes per
|
||||
event when no payload is used.
|
||||
|
||||
**Important:** The events are stored in disk following the endianness of
|
||||
the machine where they are generated. So a trace generated with a little
|
||||
endian machine would be different than on a big endian machine. Using
|
||||
the same endiannes avoids the cost of serialization when writting the
|
||||
trace at runtime.
|
||||
the machine where they are generated. So a stream generated with a little
|
||||
endian machine would be different than on a big endian machine. We
|
||||
assume the same endiannes is used to write the trace at runtime and read
|
||||
it after, at the emulation process.
|
||||
|
||||
The events are designed to be easily identified when looking at the
|
||||
raw trace in binary, as the MCV codes can be read as ASCII characters:
|
||||
raw stream in binary, as the MCV codes can be read as ASCII characters:
|
||||
|
||||
```
|
||||
00000000 0f 4f 48 78 58 c1 b0 b5 95 43 11 00 00 00 00 00 |.OHxX....C......|
|
||||
00000010 ff ff ff ff 00 00 00 00 00 00 00 00 00 36 53 72 |.............6Sr|
|
||||
00000020 ab cb b0 b5 95 43 11 00 00 36 53 73 78 c3 b9 b5 |.....C...6Ssx...|
|
||||
00000030 95 43 11 00 00 36 53 40 87 a4 c2 b5 95 43 11 00 |.C...6S@.....C..|
|
||||
00000040 00 36 53 68 9c 4b cb b5 95 43 11 00 00 36 53 66 |.6Sh.K...C...6Sf|
|
||||
00000050 85 44 d4 b5 95 43 11 00 00 36 53 5b cb e7 dc b5 |.D...C...6S[....|
|
||||
00000060 95 43 11 00 00 36 53 5d cf ca e5 b5 95 43 11 00 |.C...6S].....C..|
|
||||
00000070 00 36 53 75 8c db ee b5 95 43 11 00 00 36 53 55 |.6Su.....C...6SU|
|
||||
00000080 5a 70 f8 b5 95 43 11 00 00 36 55 5b 1b ae 01 b6 |Zp...C...6U[....|
|
||||
00000090 95 43 11 00 00 36 55 5d aa 19 0b b6 95 43 11 00 |.C...6U].....C..|
|
||||
00000000 6f 76 6e 69 01 00 00 00 0f 4f 48 78 08 ba 2e 5c |ovni.....OHx...\|
|
||||
00000010 b5 b0 00 00 00 00 00 00 ff ff ff ff 00 00 00 00 |................|
|
||||
00000020 00 00 00 00 13 56 59 63 3c c2 2e 5c b5 b0 00 00 |.....VYc<..\....|
|
||||
00000030 0e 00 00 00 01 00 00 00 74 65 73 74 74 79 70 65 |........testtype|
|
||||
00000040 31 00 07 56 54 63 43 cc 2e 5c b5 b0 00 00 01 00 |1..VTcC..\......|
|
||||
00000050 00 00 01 00 00 00 03 56 54 78 03 cd 2e 5c b5 b0 |.......VTx...\..|
|
||||
00000060 00 00 01 00 00 00 03 56 54 70 2b 7d 37 5c b5 b0 |.......VTp+}7\..|
|
||||
00000070 00 00 01 00 00 00 03 56 54 72 c3 4d 40 5c b5 b0 |.......VTr.M@\..|
|
||||
00000080 00 00 01 00 00 00 03 56 54 65 03 36 49 5c b5 b0 |.......VTe.6I\..|
|
||||
00000090 00 00 01 00 00 00 00 4f 48 65 f5 36 49 5c b5 b0 |.......OHe.6I\..|
|
||||
000000a0 00 00 |..|
|
||||
```
|
||||
|
||||
This allows a human to detect signs of corruption by just visually
|
||||
inspecting the trace.
|
||||
This allows a human to detect signs of corruption by visually inspecting
|
||||
the streams.
|
||||
|
||||
## Limitations
|
||||
|
||||
The traces are designed to be read only forward, as they only contain
|
||||
The streams are designed to be read only forward, as they only contain
|
||||
the size of each event in the header.
|
||||
|
||||
Currently, we only support using the threads as sources of events, using
|
||||
one stream per thread. However, adding support for more streams from
|
||||
multiple sources is planned for the future.
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user