diff --git a/hbs2-core/lib/HBS2/Actors/ChunkWriter.hs b/hbs2-core/lib/HBS2/Actors/ChunkWriter.hs
index fdde51f6..513ffd1d 100644
--- a/hbs2-core/lib/HBS2/Actors/ChunkWriter.hs
+++ b/hbs2-core/lib/HBS2/Actors/ChunkWriter.hs
@@ -4,7 +4,6 @@ module HBS2.Actors.ChunkWriter
   , newChunkWriterIO
   , runChunkWriter
   , stopChunkWriter
-  , newBlock
   , delBlock
   , commitBlock
   , writeChunk
@@ -50,6 +49,10 @@ import Control.Concurrent.STM.TSem (TSem)
 
 import Control.Concurrent.STM.TQueue qualified as Q0
 import Control.Concurrent
+
+import Data.HashMap.Strict (HashMap)
+import Data.HashMap.Strict qualified as HashMap
+
 --
 --
 --TODO: cache file handles
@@ -67,15 +70,16 @@ data ChunkWriter h m = forall a . ( MonadIO m
   , pipeline    :: Pipeline m ()
   , dir         :: FilePath
   , storage     :: a
-  , perBlock    :: Cache FilePath (TQueue (IO ()))
+  , perBlock    :: TVar (HashMap FilePath [IO ()])
   , perBlockSem :: Cache FilePath TSem
   }
 
 
 blocksInProcess :: MonadIO m => ChunkWriter h m -> m Int
-blocksInProcess cw = liftIO $ Cache.purgeExpired cache >> Cache.size cache
-  where
-   cache = perBlock cw
+blocksInProcess cw = undefined
+  -- liftIO $ Cache.purgeExpired cache >> Cache.size cache
+  -- where
+  --  cache = perBlock cw
 
 runChunkWriter :: forall h m . ( Eq (Hash h)
                                 , Hashable (Hash h)
@@ -84,15 +88,6 @@ runChunkWriter :: forall h m . ( Eq (Hash h)
 
 runChunkWriter = runChunkWriter2
 
-runChunkWriter1 :: forall h m . ( Eq (Hash h)
-                                , Hashable (Hash h)
-                                , MonadIO m )
-                => ChunkWriter h m -> m ()
-
-runChunkWriter1 w = do
-  liftIO $ createDirectoryIfMissing True ( dir w )
-  runPipeline (pipeline w)
-
 
 runChunkWriter2 :: forall h m . ( Eq (Hash h)
                                 , Hashable (Hash h)
@@ -101,43 +96,13 @@ runChunkWriter2 :: forall h m . ( Eq (Hash h)
 
 runChunkWriter2 w = do
   liftIO $ createDirectoryIfMissing True ( dir w )
-  let cache = perBlock w
-  fix \next -> do
-    -- kks  <- liftIO $ take 1 <$> Cache.keys cache
-    -- liftIO $ for_ kks $ \h -> flush w h
-
-    -- pause ( 1 :: Timeout 'Seconds )
-    -- yield
-    -- next
-
-    -- liftIO $ print "runChunkWriter2"
-
-    stop <- liftIO $ readTVarIO (stopped w)
-
-    if stop then do
-      ks <- liftIO $ Cache.keys cache
-      liftIO $ for_ ks $ \k -> flush w k
-    else do
-      ks <- liftIO $ Cache.keys cache
-
-      amount <- for ks $ \k -> flush w k
-
-      if (sum amount == 0) then do
-        -- pure ()
-        pause ( 0.1 :: Timeout 'Seconds )
-      else do
-        liftIO $ print ("flushed:" <+> pretty (sum amount))
+  fix \next -> pause ( 1 :: Timeout 'Seconds) >> next
 
 
 stopChunkWriter :: MonadIO m => ChunkWriter h m -> m ()
 stopChunkWriter w = do
   liftIO $ atomically $ writeTVar (stopped w) True
 
-stopChunkWriter1 :: MonadIO m => ChunkWriter h m -> m ()
-stopChunkWriter1 w = do
-  let cache = perBlock w
-  stopPipeline ( pipeline w )
-
 newChunkWriterIO :: forall h a m . ( Key h ~ Hash h, h ~ HbSync
                                    , Storage a h ByteString m
                                    , Block ByteString ~ ByteString
@@ -153,7 +118,7 @@ newChunkWriterIO s tmp = do
   def  <- liftIO $ getXdgDirectory XdgData (defStorePath  </> "temp-chunks")
   let d  = fromMaybe def tmp
 
-  mt <- liftIO $ Cache.newCache Nothing
+  mt <- liftIO $ newTVarIO mempty
   mts <- liftIO $ Cache.newCache Nothing
 
   running <- liftIO $ newTVarIO False
@@ -173,21 +138,6 @@ makeFileName w salt h = dir w </> suff
   where
     suff = show $ pretty (fromIntegral (hash salt) :: Word32) <> "@" <> pretty h
 
--- TODO: check uniqueness
-newBlock :: ( MonadIO m
-            , Hashable salt
-            , Pretty (Hash h)
-            )
-         => ChunkWriter h m
-         -> salt
-         -> Hash h
-         -> Size -> m ()
-
-newBlock w salt h size = liftIO do
-  withBinaryFile fn ReadWriteMode (`hSetFileSize` fromIntegral size)
-  where
-    fn = makeFileName w salt h
-
 delBlock :: (Hashable salt, MonadIO m, Pretty (Hash h))
          => ChunkWriter h m -> salt -> Hash h -> m ()
 
@@ -241,26 +191,6 @@ commitBlock :: forall salt h m .
 
 commitBlock = commitBlock2
 
-
-
-writeChunk1 :: (Hashable salt, MonadIO m, Pretty (Hash h))
-           => ChunkWriter h m
-           -> salt
-           -> Hash h
-           -> Offset
-           -> ByteString -> m ()
-
-writeChunk1 w salt h o bs = addJob (pipeline w) $ liftIO do
--- writeChunk w salt h o bs = liftIO do
-  -- print $ "writeChunk:" <+> pretty fn
-  withBinaryFile fn ReadWriteMode $ \fh -> do
-    hSeek fh AbsoluteSeek (fromIntegral o)
-    B.hPutStr fh bs
-    hFlush fh
-
-  where
-    fn = makeFileName w salt h
-
 writeChunk2 :: (Hashable salt, MonadIO m, Pretty (Hash h), Hashable (Hash h), Eq (Hash h))
             => ChunkWriter h m
             -> salt
@@ -272,46 +202,13 @@ writeChunk2  w salt h o bs = do
 
   let cache = perBlock w
 
-  -- liftIO $ print $ "writeChunk" <+> pretty o <+> pretty (B.length bs) <+> pretty h
+  let action = do
+        withBinaryFile fn ReadWriteMode $ \fh -> do
+          hSeek fh AbsoluteSeek (fromIntegral o)
+          B.hPutStr fh bs
 
   liftIO $ do
-    q <- Cache.fetchWithCache cache fn $ const Q0.newTQueueIO
-    atomically $ Q0.writeTQueue q $ do
-      withBinaryFile fn ReadWriteMode $ \fh -> do
-        hSeek fh AbsoluteSeek (fromIntegral o)
-        B.hPutStr fh bs
-        -- hFlush fh
-
-  where
-    fn = makeFileName w salt h
-
-
--- Blocking!
--- we need to write last chunk before this will happen
--- FIXME: incremental calculation,
---        streaming, blah-blah
-getHash1 :: forall salt h m .
-           ( Hashable salt
-           , Hashed h ByteString
-           , MonadIO m
-           , Block ByteString ~ ByteString
-           , Pretty (Hash h)
-           , Hashable (Hash h), Eq (Hash h)
-           )
-         => ChunkWriter h m
-         -> salt
-         -> Hash h
-         -> m (Hash h)
-
-getHash1 w salt h = liftIO do
-
-  q <- Q.newTBQueueIO 1
-
-  addJob (pipeline w) $ liftIO do
-    h1 <- hashObject @h <$> B.readFile fn
-    atomically $ Q.writeTBQueue q h1
-
-  atomically $ Q.readTBQueue q
+    atomically $ modifyTVar cache (HashMap.insertWith (<>) fn [action])
 
   where
     fn = makeFileName w salt h
@@ -319,28 +216,10 @@ getHash1 w salt h = liftIO do
 
 flush w fn = do
   let cache = perBlock w
-  let scache = perBlockSem w
+
   liftIO $ do
-
-    q <- Cache.fetchWithCache cache fn $ const Q0.newTQueueIO
-    s <- Cache.fetchWithCache scache fn $ const $ atomically $ Sem.newTSem 1
-
-    atomically $ Sem.waitTSem  s
-
-    Cache.delete cache fn
-
-    flushed <- atomically (Q0.flushTQueue q)
-
-    liftIO $ do
-
-      -- withBinaryFile fn ReadWriteMode $ \fh -> do
-      -- withBinaryFile fn ReadWriteMode $ \fh -> do
-      for_ flushed id
-
-    atomically $ Sem.signalTSem s
-
-    pure (length flushed)
-
+    actions <- atomically $ stateTVar cache (\v -> (HashMap.lookup fn v, HashMap.delete fn v))
+    sequence_ (fromMaybe mempty actions)
 
 -- Blocking!
 -- we need to write last chunk before this will happen
@@ -361,41 +240,12 @@ getHash2 :: forall salt h m .
 
 getHash2 w salt h = do
   flush w fn
-  h1 <- liftIO $ hashObject @h <$> B.readFile fn
-  pure h1
+  liftIO $ hashObject @h <$> B.readFile fn
 
   where
     fn = makeFileName w salt h
 
 
-commitBlock1 :: forall salt h m .
-               ( Hashable salt
-               , Hashed h ByteString
-               , Block ByteString ~ ByteString
-               , MonadIO m
-               , Pretty (Hash h)
-               )
-            => ChunkWriter h m
-            -> salt
-            -> Hash h
-            -> m ()
-
-commitBlock1 w@(ChunkWriter {storage = stor}) salt h = do
-  q <- liftIO $ Q.newTBQueueIO 1
-
-  addJob (pipeline w)  (liftIO $ B.readFile fn >>= atomically . Q.writeTBQueue q)
-
-  s <- liftIO $ atomically $ Q.readTBQueue q
-
-  void $ putBlock stor s
-
-  delBlock w salt h
-
-  where
-    fn = makeFileName w salt h
-
-
-
 commitBlock2 :: forall salt h m .
                ( Hashable salt
                , Hashed h ByteString
@@ -415,7 +265,6 @@ commitBlock2 w@(ChunkWriter {storage = stor}) salt h = do
   s <- liftIO $ B.readFile fn
   void $ putBlock stor s
   delBlock w salt h
-  liftIO $ Cache.delete cache fn
 
   where
     fn = makeFileName w salt h
diff --git a/hbs2-tests/hie.yaml b/hbs2-tests/hie.yaml
deleted file mode 100644
index a7da04bd..00000000
--- a/hbs2-tests/hie.yaml
+++ /dev/null
@@ -1,11 +0,0 @@
-cradle:
-  cabal:
-    - path: "test/Peer2Main.hs"
-      component: "hbs2-tests:exe:test-peer-run"
-
-    - path: "test/TestSKey"
-      component: "hbs2-tests:test:test-skey"
-
-    - path: "test/TestChunkWriter"
-      component: "hbs2-tests:test:test-cw"
-
diff --git a/hbs2-tests/test/TestChunkWriter.hs b/hbs2-tests/test/TestChunkWriter.hs
index fe5e25e9..25640105 100644
--- a/hbs2-tests/test/TestChunkWriter.hs
+++ b/hbs2-tests/test/TestChunkWriter.hs
@@ -31,6 +31,17 @@ main = do
 
   withSystemTempDirectory "cww-test" $ \dir -> do
 
+    let opts = [ StoragePrefix (dir </> ".test-cww")
+               ]
+
+    storage <- simpleStorageInit opts :: IO (SimpleStorage HbSync)
+
+    w1 <- replicateM 1 $ async (simpleStorageWorker storage)
+
+    cw <- newChunkWriterIO storage (Just (dir </> ".qqq"))
+
+    w2 <- replicateM 1 $ async $ runChunkWriter cw
+
     failed <- replicateM 100 $ do
 
       bytes <- B8.pack <$> (replicateM size $ uniformM g)
@@ -39,35 +50,24 @@ main = do
 
       let psz = calcChunks (fromIntegral size) (fromIntegral chu)
 
-      let opts = [ StoragePrefix (dir </> ".test-cww")
-                 ]
-
-      storage <- simpleStorageInit opts :: IO (SimpleStorage HbSync)
-
-      w1 <- replicateM 1 $ async (simpleStorageWorker storage)
-
-      cw <- newChunkWriterIO storage (Just (dir </> ".qqq"))
-
-      w2 <- replicateM 1 $ async $ runChunkWriter cw
-
       psz' <- shuffleM psz
       -- psz' <- pure psz
 
+      -- forConcurrently_ psz' $ \(o,s) -> do
       forConcurrently_ psz' $ \(o,s) -> do
-      -- forM_ psz' $ \(o,s) -> do
         let t = B8.take s $ B8.drop o bytes
         writeChunk cw 1 hash (fromIntegral o) t
 
       h2 <- getHash cw 1 hash
-      -- h3 <- getHash cw 1 hash
-
-      mapM_ cancel $ w1 <> w2
 
       if hash /= h2 then do
         pure [1]
-      else
+      else do
+        commitBlock cw 1 hash
         pure mempty
 
+    mapM_ cancel $ w1 <> w2
+
     print $ "failed" <+> pretty (sum (mconcat failed))
 
   pure ()
diff --git a/hie.yaml b/hie.yaml
index 04cd2439..9271e42b 100644
--- a/hie.yaml
+++ b/hie.yaml
@@ -1,2 +1,17 @@
 cradle:
   cabal:
+    - path: "hbs-tests/test/Peer2Main.hs"
+      component: "hbs2-tests:exe:test-peer-run"
+
+    - path: "hbs2-tests/test/TestSKey"
+      component: "hbs2-tests:test:test-skey"
+
+    - path: "hbs2-tests/test/TestChunkWriter"
+      component: "hbs2-tests:test:test-cw"
+
+    - path: "hbs2-core/lib"
+      component: "hbs2-core:lib:hbs2-core"
+
+    - path: "hbs2-storage-simple/lib"
+      component: "hbs2-storage-simple:lib:hbs2-storage-simple"
+