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FlowCheck: Decoupling Checkpointing and Training For Large-Scale Models

Code for paper "FlowCheck: Decoupling Checkpointing and Training For Large-Scale Models".

Overview

Running Environment

  • To run the code, you first need to connect the CPU checkpoint nodes as required by the paper, and configure the mirroring function of the switch.

    • In H3C switches, the configuration instructions are:
    system-view
mirroring-group 1 local
mirroring-group 1 mirroring-port XXX inbound/outbound
mirroring-group 1 monitor-port YYY

  • The minimum memory requirement for CPU checkpoint nodes varies with the scale of the workload, but we recommend that the checkpoint node memory should be no less than 300GB.

  • The code for this project utilizes Intel I/OAT functionality, so please ensure that the CPU on the checkpoint node supports this feature.

  • This project utilizes DPDK for packet dumping, so please ensure that DPDK is properly installed and the RDMA NICs in use are bound before running it. The DPDK version used in this project is 23.11.

  • If you use CX6 NICs, you need to disable RoCE:

mlxconfig -d 82:00.0 s ROCE_CONTROL=1

Build

Prior to executing the code, please ascertain that all module functionalities have been compiled.

Compiler versions used in the project: gcc 11.2.0, clang 10.0.0.

Build all modules in one line:

sh build.sh

Besides, you need to bind DPDK with DMA engines:

echo 1 > /sys/module/vfio/parameters/enable_unsafe_noiommu_mode

Running instructions

  1. Start the Real-Time Dump Module.

Here we show the example of starting the dump module of two mirror streams:

./Packet_Dump/dma_dump/build/dmafwd -l 40-41 -n 1 -a 0000:ca:00.0 -a 0000:80:01.0 -a 0000:80:01.1 -a 0000:80:01.2 -a 0000:80:01.3 -a 0000:80:01.4 -a 0000:80:01.5 -a 0000:80:01.6 -a 0000:80:01.7 --huge-unlink --file-prefix pg1 -- -p 0x1 -c hw -q 8
./Packet_Dump/dma_dump/build/dmafwd -l 22-23 -n 1 -a 0000:6b:00.0 -a 0000:00:01.0 -a 0000:00:01.1 -a 0000:00:01.2 -a 0000:00:01.3 -a 0000:00:01.4 -a 0000:00:01.5 -a 0000:00:01.6 -a 0000:00:01.7 --huge-unlink --file-prefix pg2 -- -p 0x1 -c hw -q 8

You can customize these parameters according to your own environment:

  • -l: the bind CPU core IDs.
  • -a: the PCIE address of the NIC.
  • -q: the number of used DMA engines.
  1. Start the Packet Parser Module.
./Packet_Parser/cpp_decode_inbound/build/unpack_app
./Packet_Parser/cpp_decode_outbound/build/unpack_app
  1. Start the Data Extractor Module.
./Data_Extractor/build/extract_app
  1. Start the Updater Module.
./Cython_Updater/build/app
  1. Start the workload on training nodes.

In the directory ./Workload_Gen, we showcase a minimal example of launching GPT model training.

Make sure that the all-reduce traffic is properly mirrored by the switches and transmitted to the CPU checkpoint node.