github.com/eth-easl/loader@v0.0.0-20230908084258-8a37e1d94279/server/wimpy/wimpy.go (about)

     1  /*
     2   * MIT License
     3   *
     4   * Copyright (c) 2023 EASL and the vHive community
     5   *
     6   * Permission is hereby granted, free of charge, to any person obtaining a copy
     7   * of this software and associated documentation files (the "Software"), to deal
     8   * in the Software without restriction, including without limitation the rights
     9   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    10   * copies of the Software, and to permit persons to whom the Software is
    11   * furnished to do so, subject to the following conditions:
    12   *
    13   * The above copyright notice and this permission notice shall be included in all
    14   * copies or substantial portions of the Software.
    15   *
    16   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    17   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    18   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    19   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    20   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    21   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    22   * SOFTWARE.
    23   */
    24  
    25  package main
    26  
    27  import (
    28  	"context"
    29  	"errors"
    30  	"fmt"
    31  	util "github.com/eth-easl/loader/pkg/common"
    32  	"github.com/eth-easl/loader/pkg/workload/proto"
    33  	"net"
    34  	"time"
    35  
    36  	log "github.com/sirupsen/logrus"
    37  	"golang.org/x/sys/unix"
    38  	"google.golang.org/grpc"
    39  	"google.golang.org/grpc/reflection"
    40  )
    41  
    42  type funcServer struct {
    43  	proto.UnimplementedExecutorServer
    44  }
    45  
    46  func (s *funcServer) Execute(ctx context.Context, req *proto.FaasRequest) (*proto.FaasReply, error) {
    47  	start := time.Now()
    48  	runtimeRequested := req.RuntimeInMilliSec
    49  	timeoutSem := time.After(time.Duration(runtimeRequested) * time.Millisecond)
    50  	if runtimeRequested <= 0 {
    51  		//* Some of the durations were incorrectly recorded as 0 in the trace.
    52  		return &proto.FaasReply{}, errors.New("non-positive execution time")
    53  	}
    54  
    55  	pageSize := unix.Getpagesize()
    56  	numPagesRequested := util.Mib2b(req.MemoryInMebiBytes) / uint32(pageSize)
    57  	//* Golang internally uses `mmap()`, talking to OS directly.
    58  	pages, err := unix.Mmap(-1, 0, int(numPagesRequested)*int(numPagesRequested),
    59  		unix.PROT_WRITE, unix.MAP_ANON|unix.MAP_PRIVATE)
    60  	if err != nil {
    61  		log.Errorf("Failed to allocate requested memory: %v", err)
    62  		return &proto.FaasReply{}, err
    63  	}
    64  	err = unix.Munmap(pages) //* Don't even touch the allocated pages -> let them stay virtaul memory.
    65  	util.Check(err)
    66  
    67  	<-timeoutSem //* Blocking wait.
    68  	return &proto.FaasReply{
    69  		Message:            "Wimpy func -- DONE", // Unused
    70  		DurationInMicroSec: uint32(time.Since(start).Microseconds()),
    71  		MemoryUsageInKb:    util.B2Kib(numPagesRequested * uint32(pageSize)),
    72  	}, nil
    73  }
    74  
    75  func main() {
    76  	serverPort := 80
    77  
    78  	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", serverPort))
    79  	if err != nil {
    80  		log.Fatalf("failed to listen: %v", err)
    81  	}
    82  
    83  	funcServer := &funcServer{}
    84  	grpcServer := grpc.NewServer()
    85  	reflection.Register(grpcServer) // gRPC Server Reflection is used by gRPC CLI.
    86  	proto.RegisterExecutorServer(grpcServer, funcServer)
    87  	err = grpcServer.Serve(lis)
    88  	util.Check(err)
    89  }