This is on by default in gem5 (see src/cpu/kvm/BaseKvmCPU.py), however
the perf counters only measure host instruction counters and GPUFS is
not concerned about accuracy of KVM CPU stats. There are also a larger
set of users who have access to KVM, but do not have the paranoid level
low enough to attach performance counters.
Therefore, make the performance counters OFF by default. They can still
be enabled, but this will allow for a larger set of users to follow the
upcoming GPUFS documentation without needing to read through a
troubleshooting section after seeing a gem5 error about the KVM paranoid
level.
Change-Id: I6b465559edf3ce17e7117ada049c60bd39aecd83
This change adds a new utility function for processing Spatter traces
into SpatterKernels under parse_kernels.
Additionally, it adds documentation for all the utility functions in
spatter_kernel.py.
Lastly, it adds an example script for running one spatter trace using
SpatterGenerator to the examples.
Rather than adding the options to *every* config that might be using
GPU_VIPER.py, just change the Ruby config to check if the option is
available before trying to use it. Otherwise, reverts to what was the
default on stable.
Change-Id: Ia6f1d0827d489ee2a35c598b644461cbff59e247
This allows for multiple gem5 simulations to be spawned from a single
parent gem5 process, as defined in a simgle gem5 configuration. In this
design _all_ the `Simulator`s are defined in the simulation script and
then added to the mutlisim module. For example:
```py
from gem5.simulate.Simulator import Simulator
import gem5.utils.multisim as multisim
# Construct the board[0] and board[1] as you wish here...
simulator1 = Simulator(board=board[0], id="board-1")
simulator2 = Simulator(board=board[1], id="board-2")
multisim.add_simulator(simulator1)
multisim.add_simulator(simulator2)
```
This specifies that two simulations are to be run in parallel in
seperate threads: one specified by `simulator1` and another by
`simulator2`. They are then added to MultiSim via the
`multisim.add_simulator` function. The user can specify an id via the
Simulator constructor. This is used to give each process a unique id and
output directory name. Given this, the id should be a helpful name
describing the simulation being specified. If not specified one is
automatically given.
To run these simulators we use `<gem5 binary> -m gem5.utils.multisim
<script> -p <num_processes>`. Note: multisim is an executable module in
gem5. This is the same module we input into our scripts to add the
simulators. This is an intentionally modular encapsulated design. When
the module processes a script it will schedule multiple gem5 jobs and,
dependent on the number of processes specified, will create child gem5
processes to processes tjese jobs (jobs are just gem5 simulations in
this case). The `--processes` (`-p`) argument is optional and if not
specified the max number of processes which can be run concurrently will
be the number of available threads on the host system.
The id for each process is used to create a subdirectory inside the
`outputdor` (`m5out`) of that id name. E.g, in the example above the
ID's are `board-1` and `board-2`. Therefore the m5 out directory will
look as follows:
```sh
- m5out
- board-1
- stats.txt
- config.ini
- config.json
- terminal.out
- board-2
- stats.txt
- config.ini
- config.json
- terminal.out
```
Each simulations output is encapsulated inside the subdirectory of the
id name.
If the multisim configuation script is passed directly to gem5 (like a
traditional gem5 configuraiton script, i.e.: `<gem5 binary> <script>`),
the user may run a single simulation specified in that script by passing
its id as an argument. E.g. `<gem5 binary> <script> board-1` will run
the `board-1` simulation specified in `script`. If no argument is passed
an Exception is raised asking the user to either specify or use the
MultiSim module if multiprocessing is needed.
If the user desires a list of ids of the simulations specified in a
given MultiSim script, they can do so by passing the `--list` (`-l`)
parameter to the config script. I.e., `<gem5 binary> <script> --list`
will list all the IDs for all the simulations specified in`script`.
This change comes with two new example scripts found in
'configs/example/gem5_library/multsim" to demonstrate multisim in both
an SE and FS mode simulation. Tests have been added which run these
scripts as part of gem5' Daily suite of tests.
Notes
=====
* **Bug fixed**: The `NoCache` classic cache hierarchy has been modified
so the Xbar is no longet set with a `__func__` call. This interfered
with MultiProcessing as this structure is not serializable via Pickle.
This was quite bad design anyway so should be changed
* **Change**: `readfile_contents` parameter previously wrote its value
to a file called "readfile" in the output dorectory. This has been
changed to write to a file called "readfile_{hash}" with "{hash}" being
a hash of the `readfile_contents`. This ensures that, during multisim
running, this file is not overwritten by other processes.
* **Removal note**: This implementation supercedes the functionality
outlined in 'src/python/gem5/utils/multiprocessing'. As such, this code
has been removed.
Limitations/Things to Fix/Improve
=================================
* Though each Simulator process has its own output directory (a
subdirectory within m5out, with an ID set by the user unique to that
Simulator), the stdout and stderr are still output to the terminal, not
the output directory. This results in: 1. stdout and stderr data lost
and not recorded for these runs. 2. An incredibly noisy terminal output.
* Each process uses the same cached resources. While there are locks on
resources when downloading, each processes will hash the resources they
require to ensure they are valid. This is very inefficient in cases
where resources are common between processes (e.g., you may have 10
processes each using the same disk image with each processes hashing the
disk images independently to give the same result to validate the
resources).
Change-Id: Ief5a3b765070c622d1f0de53ebd545c85a3f0eee
---------
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Co-authored-by: Jason Lowe-Power <jason@lowepower.com>
The GPUFS scripts include support for dumping and resetting
stats at kernel boundaries by identifying specific GPU kernel
exit events. This commit extends that support to work with
GPU SE-mode support.
Change-Id: I662233ae71e2987d90af1fd0100e29036b2ef1c6
GPU_VIPER.py was modified to use these options but they did not exist,
breaking GPUFS. This commit adds them to fix the issue.
Change-Id: I0095f400ea606c4e8d91a41870ef208465cef803
Adding RP_choose function to change replacement policies among
TreePLRU, LRU, FIFO, LFU, LIP, MRU, NRU, RRIP, SecondChance AND ShiPMem replacement
policies for TCC, TCP and SQC caches for GPU
Adding RP_choose functions to change replacement policies among
TreePLRU, LRU, FIFO, LFU, LIP, MRU, NRU, RRIP, SecondChance AND ShiPMem replacement
policies for TCC, TCP and SQC caches for GPU
Adding RP_choose functions to change replacement policies among
TreePLRU, LRU, FIFO, LFU, LIP, MRU, NRU, RRIP, SecondChance AND ShiPMem replacement
policies for TCC, TCP and SQC caches for GPU
Add a config capable of simulating MI300X ISA (gfx942). This is similar
to the mi200.py config and uses the same scripts followed by some
tuneable parameters. This config optionally lets the user call the
runMI300GPU function with gem5 resources. This allows for something like
the following before a VIPER stdlib python is available:
```
import mi300
from gem5.resources.resource import obtain_resource
disk = obtain_resource("x86-gpu-fs-img")
kernel = obtain_resource("x86-linux-kernel-5.4.0-105-generic")
app = obtain_resource("square-gpu-test")
mi300.runMI300GPUFS("X86KvmCPU", disk, kernel, app)
```
Tested cold boot config, checkpoint create and restore, and using gem5
resources.
Change-Id: I50a13d7a3d207786b779bf7fd47a5645256b1e6a
This is the version for MI300. For the most part, it is the same as
MI200 with the exception of architected flat scratch (not yet
implemented in gem5) and therefore a new version enum is required.
Change-Id: Id18cd7b57c4eebd467c010a3f61e3117beb8d58a
These changes to sweep and sweep_hybrid for NVM allow them to run. I'm
not an expert on this, so I'm not sure if these are technically correct,
but they no longer fail when running
`build/X86/gem5.opt configs/nvm/sweep.py` and `build/X86/gem5.opt
configs/nvm/sweep_hybrid.py`
GitHub Issue: #669
The extended control registers were not being updated in the KVM thread
context nor updated in the KVM state. This was causing issues when
checkpointing since the XCR0 value was reverting to the default value
rather than what it was previously before the checkpoint. THis was
causing multiple applications to crash due to executing instructions
which are now illegal instructions due to XCR0 being incorrect.
This commit adds the XCR0 as a misc register similar to the exiting x86
control registers and adds all of the helper functions to access and set
the register value. It also adds support for updating the KVM CPU's
state with the register value and updating the thread context's misc reg
value so that it is checkpointed along with the other misc regs.
Note that this does *not* add support for XSAVE of the AVX state (i.e.,
the upper 128 bits of YMM registers). It does however fix the immediate
problem in issue #958 .
Change-Id: I97456c8b57cbc7b381bd4be94944ce6567a43c76
Includes fixes for several bugs reported via email, self found, and
internal reports. Also includes runs through Valgrind and UBsan. See
individual commits for more details.
The scalar cache is not being invalidated which causes stale data to be
left in the scalar cache between GPU kernels. This commit sends
invalidates to the scalar cache when the SQC is invalidated. This is a
sufficient baseline for simulation.
Since the number of invalidates might be larger than the mandatory queue
can hold and no flash invalidate mechanism exists in the VIPER protocol,
the command line option for the mandatory queue size is removed, which
is the same behavior as the SQC.
Change-Id: I1723f224711b04caa4c88beccfa8fb73ccf56572
The address has one too many zeros and is therefore placed in a memory
region usually used for system memory. As a result this causes failure
when trying to run a simulation with a huge amount of memory.
Change the address to be within the C000'0000h - FFFF'FFFFh X86 I/O hole
as was intended.
Change-Id: I5d03ac19ea3b2c01a8c431073c12fa1868b3df24
A user reported a bug with the SSE4.1 version of memcmp in libc. When
enabled the simulated program crashes with SIGILL. After attempting all
fixes recommended by Intel SDM and still not working, turning the bit
off instead.
Similar, the default XSAVE functionality is not completely implemented
for AVX and newer ISA extensions. Therefore, there is not much point to
claiming to support the more advanced versions of XSAVE (XSAVEOPT,
XSAVEC, XSAVES, and XGETBV with ECX=1).
Note that none of these bits are enabled for non-GPU full system
simulations (see src/arch/x86/X86ISA.py). This only impacts GPUFS
simulations.
Change-Id: I8eb7bf0f2a0a29226095e7889fec9c1e8a65f88f
This PR is offloading some of the partitioning logic to the partitioning
manager, effectively changing
the partitioning interface. Rather than always relying on the
PartitionFieldExtention data structure to
convey partition IDs, we make it implementation defined by introducing
the partitioning manager abstraction.
We want user to be able to extract the partitionId more flexibly and
this requires using a SimObject.
Users can extend the PartitioningManager, overriding the
readPacketPartitionId, therefore providing their
own mean of injecting/extracting partitioning data from a packet
This change sets the `release` of the ARM board at the config file
instead of overriding the release on the ArmBoard. This change partially
solves issue 932 as the system taking and restoring the checkpoint is
consistent across KVM and timing CPUs respectively.
Signed-off-by: Kaustav Goswami <kggoswami@ucdavis.edu>
Currently gem5 assumes that there is only one command processor (CP)
which contains the PM4 packet processor. Some GPU devices have multiple
CPs which the driver tests individually during POST if they are used or
not. Therefore, these additional CPs need to be supported.
This commit allows for multiple PM4 packet processors which represent
multiple CPs. Each of these processors will have its own independent
MMIO address range. To more easily support ranges, the MMIO addresses
now use AddrRange to index a PM4 packet processor instead of the
hard-coded constexpr MMIO start and size pairs.
By default only one PM4 packet processor is created, meaning the
functionality of the simulation is unchanged for devices currently
supported in gem5.
Change-Id: I977f4fd3a169ef4a78671a4fb58c8ea0e19bf52c
The top level AMDGPUDevice currently reads/writes all unknown registers
to/from a map containing the previously written value. This is intended
as a way to handle registers that are not part of the model but the
driver requires for functionality. Since this is at the top level, it
can mask changes to register values which do not go through the same
interface. For example, reading an MMIO, changing via PM4 queue, and
reading again returns the stale cached value.
This commit removes the usage of the regs map in AMDGPUDevice,
implements some important MMIOs that were previously handled by it, and
moves the unknown register handling to the NBIO aperture only. To reduce
the number of additional MMIOs to implement, the display manager in
vega10 is now disabled.
Change-Id: Iff0a599dd82d663c7e710b79c6ef6d0ad1fc44a2
gpu-compute: Add support for skipping GPU kernels
This commit adds two new command-line options:
--skip-until-gpu-kernel N
Skips (non-blit) GPU kernels until the target kernel is reached.
Execution continues normally from there. Blit kernels are not skipped
because they are responsible for copying the kernel code and metadata
for the non-blit kernels. Note that skipping kernels can impact
correctness; this feature is only useful if the kernel of interest has
no data-dependent behavior, or its data-dependent behavior is not based
on data generated by the skipped kernels.
--exit-after-gpu-kernel N
Ends the simulation after completing (non-blit) GPU kernel N.
This commit also renames two existing command-line options:
--debug-at-gpu-kernel -> --debug-at-gpu-task
--exit-at-gpu-kernel -> --exit-at-gpu-task
These were renamed because they count GPU tasks, which include both
kernels launched by the application as well as blit kernels.
Change-Id: If250b3fd2db05c1222e369e9e3f779c4422074bc
This change fixes two issues:
1) The --cacheline_size option was setting the system cache line size
but not the Ruby cache line size, and the mismatch was causing assertion
failures.
2) The submitDispatchPkt() function accesses the kernel object in
chunks, with the chunk size equal to the cache line size. For cache line
sizes >64B (e.g. 128B), the kernel object is not guaranteed to be
aligned to a cache line and it was possible for a chunk to be partially
contained in two separate device memories, causing the memory access to
fail.
Change-Id: I8e45146901943e9c2750d32162c0f35c851e09e1
Co-authored-by: Michael Boyer <Michael.Boyer@amd.com>
As X86 and RISCV are relying on a Table Walker cache, we
change their stdlib configs to use the newly defined
PrivateL1PrivateL2WalkCacheHierarchy
Change-Id: I63c3f70a9daa3b2c7a8306e51af8065bf1bea92b
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
* Add Cache partitioning policies to manage and enforce cache
partitioning:
* Add Way partition policy
* Add MaxCapacity partition policy
* Add PartitionFieldsExtension Extension class for Packets to store
Partition IDs for cache partitioning and monitoring
* Modify Cache SimObjects to store partition policies
* Modify Cache block eviction logic to use new partitioning policies
Co-authored-by: Adrian Herrera <adrian.herrera@arm.com>
Change-Id: Ib35153a8b46803c22a433926270d82e5e19ce544
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
* Add Cache partitioning policies to manage and enforce cache partitioning:
* Add Way partition policy
* Add MaxCapacity partition policy
* Add PartitionFieldsExtension Extension class for Packets to store
Partition IDs for cache partitioning and monitoring
* Modify Cache Tags SimObjects to store partition policies
* Modify Cache Tags block eviction logic to use new partitioning policies
* Add example system and TrafficGen configurations for testing Cache
Partitioning Policies
Change-Id: Ic3fb0f35cf060783fbb9289380721a07e18fad49
Co-authored-by: Adrian Herrera <adrian.herrera@arm.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Fix#874, in which running se.py with 4GB or more memory (via option
--mem-size=4GB) causes all KVM programs to crash or hang. This occurred
because the m5ops address range (set to 0xFFFF0000-0x100000000)
overlapped with physical memory under such a configuration.
This patch fixes the bug by moving the m5ops address range if phyiscal
memory is >=4GB.
Change-Id: Ic8a004517bc2be2c27860ed314460be749a11dc1
This change adds support to use KVM cores on the ARM board. The board
simulates gic to enable KVM, similar to the gem5 ARM FS configs. The
limitation is that it only supports VExpress_GEM5_V1.
Signed-off-by: Kaustav Goswami <kggoswami@ucdavis.edu>
Replace instances of "GCN3" with Vega. Remove gfx801 and gfx803. Rename
FIJI to Vega and Carrizo to Raven.
Using misc since there is not enough room to fit all the tags.
Change-Id: Ibafc939d49a69be9068107a906e878408c7a5891
This is matching what we are already doing in the starter_fs.py script
Change-Id: I50239050be9bd151a607ec892f8dd9322b24040b
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
The RFC is defaulted to a size of 0 which removes it completely. To use
the RFC set the --register-file-cache-size to a non-zero multiple of
two. In addition, rfc_pipe_length may be altered to increase or decrease
RFC latency benefit.
The RFC is defaulted to a size of 0 which removes it completely. To use
the RFC set the --register-file-cache-size to a non-zero multiple of
two. In addition, rfc_pipe_length may be altrered to increase or
decrease RFC latency benefit.
Change-Id: I6f5bf5b750eb64155fbc8c8343e9feadce5c9f79
The args.cpu_type is not a type but a string so the isinstance checking
will always fail and an assertion will always be thrown
A cherry-pick of #684 to develop
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Co-authored-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
After removing `get_runtime_isa`, the `send_evicts` function in the ruby
configs assumes that there is an ISA built. This change short-circuits
that logic if the current build is the NULL (none) ISA.
Change-Id: I75fefe3d70649b636b983c4d2145c63a9e1342f7
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
configs/ruby/Ruby.py fails when `DerivO3CPU` is not compiled into the
gem5 binary. The `isinstance` check fails. This fix addds a guard.
Change-Id: I1e5503ab18ec94683056c6eb28cebeda6632ae8e
