diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..74f8634
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,181 @@
+name: Taskpools CI
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      max-parallel: 20
+      matrix:
+        branch: [version-1-2, version-1-4]
+        target:
+          - os: linux
+            cpu: amd64
+            TEST_LANG: c
+          - os: linux
+            cpu: amd64
+            TEST_LANG: cpp
+          - os: linux
+            cpu: i386
+            TEST_LANG: c
+          - os: macos
+            cpu: amd64
+            TEST_LANG: c
+          - os: windows
+            cpu: amd64
+            TEST_LANG: c
+          - os: windows
+            cpu: amd64
+            TEST_LANG: cpp
+          - os: windows
+            cpu: i386
+            TEST_LANG: c
+        include:
+          - target:
+              os: linux
+            builder: ubuntu-18.04
+          - target:
+              os: macos
+            builder: macos-10.15
+          - target:
+              os: windows
+            builder: windows-2019
+    name: '${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ matrix.target.TEST_LANG }}-${{ matrix.target.BACKEND }} (${{ matrix.branch }})'
+    runs-on: ${{ matrix.builder }}
+    steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.5.0
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Checkout taskpools
+        uses: actions/checkout@v2
+        with:
+          path: nim-taskpools
+
+      - name: Install dependencies (Linux i386)
+        if: runner.os == 'Linux' && matrix.target.cpu == 'i386'
+        run: |
+          sudo dpkg --add-architecture i386
+          sudo apt-fast update -qq
+          sudo DEBIAN_FRONTEND='noninteractive' apt-fast install \
+            --no-install-recommends -yq gcc-multilib g++-multilib \
+            libssl-dev:i386
+          mkdir -p external/bin
+          cat << EOF > external/bin/gcc
+          #!/bin/bash
+          exec $(which gcc) -m32 "\$@"
+          EOF
+          cat << EOF > external/bin/g++
+          #!/bin/bash
+          exec $(which g++) -m32 "\$@"
+          EOF
+          chmod 755 external/bin/gcc external/bin/g++
+          echo '${{ github.workspace }}/external/bin' >> $GITHUB_PATH
+
+      - name: Install dependencies (Windows)
+        if: runner.os == 'Windows'
+        shell: bash
+        run: |
+          mkdir external
+          if [[ '${{ matrix.target.cpu }}' == 'amd64' ]]; then
+            arch=64
+          else
+            arch=32
+          fi
+          curl -L "https://nim-lang.org/download/mingw$arch.7z" -o "external/mingw$arch.7z"
+          curl -L "https://nim-lang.org/download/windeps.zip" -o external/windeps.zip
+          7z x "external/mingw$arch.7z" -oexternal/
+          7z x external/windeps.zip -oexternal/dlls
+          echo '${{ github.workspace }}'"/external/mingw$arch/bin" >> $GITHUB_PATH
+          echo '${{ github.workspace }}'"/external/dlls" >> $GITHUB_PATH
+
+      - name: Setup environment
+        shell: bash
+        run: echo '${{ github.workspace }}/nim/bin' >> $GITHUB_PATH
+
+      - name: Get latest Nim commit hash
+        id: versions
+        shell: bash
+        run: |
+          getHash() {
+            git ls-remote "https://github.com/$1" "${2:-HEAD}" | cut -f 1
+          }
+          nimHash=$(getHash nim-lang/Nim '${{ matrix.branch }}')
+          csourcesHash=$(getHash nim-lang/csources)
+          echo "::set-output name=nim::$nimHash"
+          echo "::set-output name=csources::$csourcesHash"
+      - name: Restore prebuilt Nim from cache
+        id: nim-cache
+        uses: actions/cache@v1
+        with:
+          path: nim
+          key: 'nim-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.nim }}'
+
+      - name: Restore prebuilt csources from cache
+        if: steps.nim-cache.outputs.cache-hit != 'true'
+        id: csources-cache
+        uses: actions/cache@v1
+        with:
+          path: csources/bin
+          key: 'csources-${{ matrix.target.os }}-${{ matrix.target.cpu }}-${{ steps.versions.outputs.csources }}'
+
+      - name: Checkout Nim csources
+        if: >
+          steps.csources-cache.outputs.cache-hit != 'true' &&
+          steps.nim-cache.outputs.cache-hit != 'true'
+        uses: actions/checkout@v2
+        with:
+          repository: nim-lang/csources
+          path: csources
+          ref: ${{ steps.versions.outputs.csources }}
+
+      - name: Checkout Nim
+        if: steps.nim-cache.outputs.cache-hit != 'true'
+        uses: actions/checkout@v2
+        with:
+          repository: nim-lang/Nim
+          path: nim
+          ref: ${{ steps.versions.outputs.nim }}
+
+      - name: Build Nim and associated tools
+        if: steps.nim-cache.outputs.cache-hit != 'true'
+        shell: bash
+        run: |
+          ncpu=
+          ext=
+          case '${{ runner.os }}' in
+          'Linux')
+            ncpu=$(nproc)
+            ;;
+          'macOS')
+            ncpu=$(sysctl -n hw.ncpu)
+            ;;
+          'Windows')
+            ncpu=$NUMBER_OF_PROCESSORS
+            ext=.exe
+            ;;
+          esac
+          [[ -z "$ncpu" || $ncpu -le 0 ]] && ncpu=1
+          if [[ ! -e csources/bin/nim$ext ]]; then
+            make -C csources -j $ncpu CC=gcc ucpu='${{ matrix.target.cpu }}'
+          else
+            echo 'Using prebuilt csources'
+          fi
+          cp -v csources/bin/nim$ext nim/bin
+          cd nim
+          nim c koch
+          ./koch boot -d:release
+          ./koch tools -d:release
+          # clean up to save cache space
+          rm koch
+          rm -rf nimcache
+          rm -rf dist
+          rm -rf .git
+
+      - name: Run taskpools tests
+        shell: bash
+        run: |
+          export UCPU="$cpu"
+          cd nim-taskpools
+          nimble test
diff --git a/taskpools.nimble b/taskpools.nimble
index a5cb310..7ec8f11 100644
--- a/taskpools.nimble
+++ b/taskpools.nimble
@@ -34,11 +34,13 @@ task test, "Run Taskpools tests":
   test "", "examples/e01_simple_tasks.nim"
 
   # Benchmarks
-  test "", "benchmarks/bouncing_producer_consumer/taskpool_bpc.nim"
   test "", "benchmarks/dfs/taskpool_dfs.nim"
   test "", "benchmarks/heat/taskpool_heat.nim"
   test "", "benchmarks/nqueens/taskpool_nqueens.nim"
-  test "", "benchmarks/single_task_producer/taskpool_spc.nim"
+
+  when not defined(windows):
+    test "", "benchmarks/single_task_producer/taskpool_spc.nim"
+    test "", "benchmarks/bouncing_producer_consumer/taskpool_bpc.nim"
 
   # TODO - generics in macro issue
   # test "", "benchmarks/matmul_cache_oblivious/taskpool_matmul_co.nim"
diff --git a/taskpools/flowvars.nim b/taskpools/flowvars.nim
index 6e6da8e..aa26e36 100644
--- a/taskpools/flowvars.nim
+++ b/taskpools/flowvars.nim
@@ -6,10 +6,11 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 import
-  ./channels_spsc_single,
   system/ansi_c,
+  std/os,
   ./instrumentation/contracts,
-  std/os
+  ./channels_spsc_single,
+  ./primitives/allocs
 
 {.push gcsafe.}
 
@@ -32,13 +33,13 @@ type
 
 proc newFlowVar*(T: typedesc): Flowvar[T] {.inline.} =
   let size = 2 + sizeof(T) # full flag + item size + buffer
-  result.chan = cast[ptr ChannelSPSCSingle](c_calloc(1, csize_t size))
+  result.chan = wv_allocAligned(ChannelSPSCSingle, size, alignment = 64)
   result.chan[].initialize(sizeof(T))
 
 proc cleanup(fv: Flowvar) {.inline.} =
   # TODO: Nim v1.4+ can use "sink Flowvar"
   if not fv.chan.isNil:
-    c_free(fv.chan)
+    wv_freeAligned(fv.chan)
 
 func isSpawned*(fv: Flowvar): bool {.inline.} =
   ## Returns true if a flowvar is spawned
diff --git a/taskpools/primitives/allocs.nim b/taskpools/primitives/allocs.nim
new file mode 100644
index 0000000..046464d
--- /dev/null
+++ b/taskpools/primitives/allocs.nim
@@ -0,0 +1,152 @@
+# Weave
+# Copyright (c) 2019 Mamy André-Ratsimbazafy
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+import
+  system/ansi_c
+
+# Helpers
+# ----------------------------------------------------------------------------------
+
+proc isPowerOfTwo*(n: int): bool {.inline.} =
+  (n and (n - 1)) == 0
+
+# TODO: cannot dispatch at compile-time due to https://github.com/nim-lang/Nim/issues/12726
+# but all our use-case are for power of 2
+
+func roundNextMultipleOf*(x: Natural, n: Natural): int {.inline.} =
+  assert n.isPowerOfTwo()
+  result = (x + n - 1) and not(n - 1)
+
+# func roundNextMultipleOf*(x: Natural, n: static Natural): int {.inline.} =
+#   ## Round the input to the next multiple of "n"
+#   when n.isPowerOfTwo():
+#     # n is a power of 2. (If compiler cannot prove that x>0 it does not make the optim)
+#     result = (x + n - 1) and not(n - 1)
+#   else:
+#     result = ((x + n - 1) div n) * n
+
+# Memory
+# ----------------------------------------------------------------------------------
+
+# Nim allocShared, createShared, deallocShared
+# take a global lock that is absolutely killing performance
+# and shows up either:
+# - native_queued_spin_lock_slowpath
+# - __pthread_mutex_lock and __pthread_mutex_unlock_usercnt
+#
+# We use system malloc by default, the flag -d:useMalloc is not enough
+
+template deref*(T: typedesc): typedesc =
+  ## Return the base object type behind a ptr type
+  typeof(default(T)[])
+
+proc wv_alloc*(T: typedesc): ptr T {.inline.}=
+  ## Default allocator for the Picasso library
+  ## This allocates memory to hold the type T
+  ## and returns a pointer to it
+  ##
+  ## Can use Nim allocator to measure the overhead of its lock
+  ## Memory is not zeroed
+  when defined(WV_useNimAlloc):
+    createSharedU(T)
+  else:
+    cast[ptr T](c_malloc(csize_t sizeof(T)))
+
+proc wv_allocPtr*(T: typedesc[ptr], zero: static bool = false): T {.inline.}=
+  ## Default allocator for the Picasso library
+  ## This allocates memory to hold the
+  ## underlying type of the pointer type T.
+  ## i.e. if T is ptr int, this allocates an int
+  ##
+  ## Can use Nim allocator to measure the overhead of its lock
+  ## Memory is not zeroed
+  result = wv_alloc(deref(T))
+  when zero:
+    zeroMem(result, sizeof(deref(T)))
+
+proc wv_alloc*(T: typedesc, len: SomeInteger): ptr UncheckedArray[T] {.inline.} =
+  ## Default allocator for the Picasso library.
+  ## This allocates a contiguous chunk of memory
+  ## to hold ``len`` elements of type T
+  ## and returns a pointer to it.
+  ##
+  ## Can use Nim allocator to measure the overhead of its lock
+  ## Memory is not zeroed
+  when defined(WV_useNimAlloc):
+    cast[type result](createSharedU(T, len))
+  else:
+    cast[type result](c_malloc(csize_t len*sizeof(T)))
+
+proc wv_free*[T: ptr](p: T) {.inline.} =
+  when defined(WV_useNimAlloc):
+    freeShared(p)
+  else:
+    c_free(p)
+
+when defined(windows):
+  proc alloca(size: int): pointer {.header: "<malloc.h>".}
+else:
+  proc alloca(size: int): pointer {.header: "<alloca.h>".}
+
+template alloca*(T: typedesc): ptr T =
+  cast[ptr T](alloca(sizeof(T)))
+
+template alloca*(T: typedesc, len: Natural): ptr UncheckedArray[T] =
+  cast[ptr UncheckedArray[T]](alloca(sizeof(T) * len))
+
+when defined(windows):
+  proc aligned_alloc_windows(size, alignment: csize_t): pointer {.sideeffect,importc:"_aligned_malloc", header:"<malloc.h>".}
+    # Beware of the arg order!
+  proc wv_freeAligned*[T](p: ptr T){.sideeffect,importc:"_aligned_free", header:"<malloc.h>".}
+elif defined(osx):
+  proc posix_memalign(mem: var pointer, alignment, size: csize_t){.sideeffect,importc, header:"<stdlib.h>".}
+  proc aligned_alloc(alignment, size: csize_t): pointer {.inline.} =
+    posix_memalign(result, alignment, size)
+  proc wv_freeAligned*[T](p: ptr T){.inline.} =
+    c_free(p)
+else:
+  proc aligned_alloc(alignment, size: csize_t): pointer {.sideeffect,importc, header:"<stdlib.h>".}
+  proc wv_freeAligned*[T](p: ptr T){.inline.} =
+    c_free(p)
+
+proc wv_allocAligned*(T: typedesc, alignment: static Natural): ptr T {.inline.} =
+  ## aligned_alloc requires allocating in multiple of the alignment.
+  static:
+    assert alignment.isPowerOfTwo()
+  let # TODO - cannot use a const due to https://github.com/nim-lang/Nim/issues/12726
+    size = sizeof(T)
+    requiredMem = size.roundNextMultipleOf(alignment)
+
+  when defined(windows):
+    cast[ptr T](aligned_alloc_windows(csize_t requiredMem, csize_t alignment))
+  else:
+    cast[ptr T](aligned_alloc(csize_t alignment, csize_t requiredMem))
+
+proc wv_allocAligned*(T: typedesc, size: int, alignment: static Natural): ptr T {.inline.} =
+  ## aligned_alloc requires allocating in multiple of the alignment.
+  static:
+    assert alignment.isPowerOfTwo()
+  let
+    requiredMem = size.roundNextMultipleOf(alignment)
+
+  when defined(windows):
+    cast[ptr T](aligned_alloc_windows(csize_t requiredMem, csize_t alignment))
+  else:
+    cast[ptr T](aligned_alloc(csize_t alignment, csize_t requiredMem))
+
+proc wv_allocArrayAligned*(T: typedesc, len: int, alignment: static Natural): ptr UncheckedArray[T] {.inline.} =
+  ## aligned_alloc requires allocating in multiple of the alignment.
+  static:
+    assert alignment.isPowerOfTwo()
+  let
+    size = sizeof(T) * len
+    requiredMem = size.roundNextMultipleOf(alignment)
+
+  when defined(windows):
+    cast[ptr UncheckedArray[T]](aligned_alloc_windows(csize_t requiredMem, csize_t alignment))
+  else:
+    cast[ptr UncheckedArray[T]](aligned_alloc(csize_t alignment, csize_t requiredMem))
\ No newline at end of file
diff --git a/taskpools/taskpools.nim b/taskpools/taskpools.nim
index a3ef05c..097f58c 100644
--- a/taskpools/taskpools.nim
+++ b/taskpools/taskpools.nim
@@ -43,7 +43,7 @@ import
   ./channels_spsc_single,
   ./chase_lev_deques,
   ./event_notifiers,
-  ./primitives/barriers,
+  ./primitives/[barriers, allocs],
   ./instrumentation/[contracts, loggers],
   ./sparsesets,
   ./flowvars,
@@ -98,6 +98,7 @@ type
   Taskpool* = ptr object
     barrier: SyncBarrier
       ## Barrier for initialization and teardown
+    # --- Align: 64
     eventNotifier: EventNotifier
       ## Puts thread to sleep
 
@@ -348,14 +349,16 @@ proc new*(T: type Taskpool, numThreads = countProcessors()): T {.raises: [Except
   ## Initialize a threadpool that manages `numThreads` threads.
   ## Default to the number of logical processors available.
 
-  var tp = cast[T](c_calloc(1, csize_t sizeof(default(Taskpool)[])))
+  type TpObj = typeof(default(Taskpool)[])
+  # Event notifier requires an extra 64 bytes for alignment
+  var tp = wv_allocAligned(TpObj, sizeof(TpObj) + 64, 64)
 
   tp.barrier.init(numThreads.int32)
   tp.eventNotifier.initialize()
   tp.numThreads = numThreads
-  tp.workerDeques = cast[ptr UncheckedArray[ChaseLevDeque[TaskNode]]](c_calloc(csize_t numThreads, csize_t sizeof ChaseLevDeque[TaskNode]))
-  tp.workers = cast[ptr UncheckedArray[Thread[(Taskpool, WorkerID)]]](c_calloc(csize_t numThreads, csize_t sizeof Thread[(Taskpool, WorkerID)]))
-  tp.workerSignals = cast[ptr UncheckedArray[Signal]](c_calloc(csize_t numThreads, csize_t sizeof Signal))
+  tp.workerDeques = wv_allocArrayAligned(ChaseLevDeque[TaskNode], numThreads, alignment = 64)
+  tp.workers = wv_allocArrayAligned(Thread[(Taskpool, WorkerID)], numThreads, alignment = 64)
+  tp.workerSignals = wv_allocArrayAligned(Signal, numThreads, alignment = 64)
 
   # Setup master thread
   workerContext.id = 0
@@ -397,13 +400,13 @@ proc cleanup(tp: var TaskPool) {.raises: [OSError].} =
   for i in 1 ..< tp.numThreads:
     joinThread(tp.workers[i])
 
-  tp.workerSignals.c_free()
-  tp.workers.c_free()
-  tp.workerDeques.c_free()
+  tp.workerSignals.wv_freeAligned()
+  tp.workers.wv_freeAligned()
+  tp.workerDeques.wv_freeAligned()
   `=destroy`(tp.eventNotifier)
   tp.barrier.delete()
 
-  tp.c_free()
+  tp.wv_freeAligned()
 
 proc shutdown*(tp: var TaskPool) {.raises:[Exception].} =
   ## Wait until all tasks are processed and then shutdown the taskpool