diff --git a/hbs2-git3/app/Main.hs b/hbs2-git3/app/Main.hs
index ce6d4a2c..03d075ee 100644
--- a/hbs2-git3/app/Main.hs
+++ b/hbs2-git3/app/Main.hs
@@ -1042,8 +1042,7 @@ theDict = do
 
             tn <- getNumCapabilities
 
-            sourceQ <- newTBQueueIO (fromIntegral tn * 10)
-
+            sourceQ <- newTBQueueIO (fromIntegral tn * 1024)
 
             let write sz_ fh ss = do
                  LBS.hPutStr fh ss
@@ -1090,14 +1089,25 @@ theDict = do
 
             progress_ <- newTVarIO 0
 
+            -- (pool, gitCatBatchQ) <- lift $ limitedResourceWorkerRequestQ tn startGitCat stopProcess
+
+            -- link pool
+
+            gitCatBatchQ <- contWorkerPool 16 do
+              che <- ContT withGitCat
+              pure $ gitReadObjectMaybe che
+
+            -- void $ ContT $ bracket (pure pool) cancel
+
             workers <- lift $ forM (zip [0..] commitz) $ \(i,chunk) -> async $ flip runContT pure do
-              theReader <- ContT withGitCat
+
+              -- let gitCatBatchQ commit = gitReadObjectMaybe theReader commit
 
               for_ chunk  \commit -> do
 
                   atomically $ modifyTVar progress_ succ
 
-                  (_,self) <- gitReadObjectMaybe theReader commit
+                  (_,self) <- lift (gitCatBatchQ commit)
                                  >>= orThrow (GitReadError (show $ pretty commit))
 
                   tree <- gitReadCommitTree self
@@ -1109,7 +1119,7 @@ theDict = do
                   for_ hashes $ \gh -> do
                     atomically $ modifyTVar _already (HS.insert gh)
                     -- debug $ "object" <+> pretty gh
-                    (_t,lbs) <- gitReadObjectMaybe theReader gh
+                    (_t,lbs) <- lift (gitCatBatchQ gh)
                                    >>= orThrow (GitReadError (show $ pretty gh))
 
                     let e = [ Builder.byteString (coerce gh)
@@ -1189,11 +1199,32 @@ contWorkerPool' n contWorker = do
     -- возвращаем функцию, с помощью которой отправлять воркерам запрос
     -- и получать ответ
     pure \a -> do
-      tmv <- atomically newEmptyTMVar
+      tmv <- newEmptyTMVarIO
       atomically $ writeTQueue inQ (a, atomically . STM.putTMVar tmv)
       pure do
         either throwIO pure =<< atomically (readTMVar tmv)
 
+
+limitedResourceWorkerRequestQ :: MonadUnliftIO m
+                              => Int
+                              -> m r                  -- ^ create resource
+                              -> ( r -> m () )        -- ^ destroy resource
+                              -> m ( Async (), (r -> m b) -> m b )
+
+limitedResourceWorkerRequestQ n create destroy = do
+  inQ <- newTQueueIO
+  ass <- async $ flip runContT pure do
+    replicateM_  n do
+        (link <=< ContT . withAsync) $ flip runContT pure do
+          r <- ContT $ bracket create destroy
+          (fix . (>>)) $ atomically (readTQueue inQ) >>= \(a,reply) -> do
+            lift (tryAny (a r)) >>= reply
+
+  pure $ (ass, \fn -> do
+    tmv <- newEmptyTMVarIO
+    atomically $ writeTQueue inQ (fn, atomically . STM.putTMVar tmv)
+    atomically (readTMVar tmv) >>= either throwIO pure)
+
 linearSearchLBS hash lbs = do
 
   found <- S.toList_ $ runConsumeLBS lbs $ flip fix 0 \go n -> do
diff --git a/hbs2-git3/lib/HBS2/Git3/Git.hs b/hbs2-git3/lib/HBS2/Git3/Git.hs
index 61b5940d..aa09aa4c 100644
--- a/hbs2-git3/lib/HBS2/Git3/Git.hs
+++ b/hbs2-git3/lib/HBS2/Git3/Git.hs
@@ -139,11 +139,15 @@ gitReadHEAD = runMaybeT do
 
 withGitCat ::  (MonadIO m) => (Process Handle Handle () -> m a) -> m a
 withGitCat action = do
+  p <- startGitCat
+  action p
+
+startGitCat :: MonadIO m => m (Process Handle Handle ())
+startGitCat = do
   let cmd = "git"
   let args = ["cat-file", "--batch"]
   let config = setStdin createPipe $ setStdout createPipe $ setStderr closed $ proc cmd args
-  p <- startProcess config
-  action p
+  startProcess config
 
 withGitCatCheck ::  (MonadIO m) => (Process Handle Handle () -> m a) -> m a
 withGitCatCheck action = do